SharePoint 2010 Site Templates

All templates are only available via the Powershell (with local Admin permission):

PS C:\Windows\system32> Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction "SilentlyContinue"
PS C:\Windows\system32> Get-SPWebTemplate
Name                 Title                                    LocaleId   Custom
----                 -----                                    --------   ------
GLOBAL#0             Global template                          1033       False
STS#0                Team Site                                1033       False
STS#1                Blank Site                               1033       False
STS#2                Document Workspace                       1033       False
MPS#0                Basic Meeting Workspace                  1033       False
MPS#1                Blank Meeting Workspace                  1033       False
MPS#2                Decision Meeting Workspace               1033       False
MPS#3                Social Meeting Workspace                 1033       False
MPS#4                Multipage Meeting Workspace              1033       False
CENTRALADMIN#0       Central Admin Site                       1033       False
WIKI#0               Wiki Site                                1033       False
BLOG#0               Blog                                     1033       False
SGS#0                Group Work Site                          1033       False
TENANTADMIN#0        Tenant Admin Site                        1033       False
ACCSRV#0             Access Services Site                     1033       False
ACCSRV#1             Assets Web Database                      1033       False
ACCSRV#3             Charitable Contributions Web Database    1033       False
ACCSRV#4             Contacts Web Database                    1033       False
ACCSRV#6             Issues Web Database                      1033       False
ACCSRV#5             Projects Web Database                    1033       False
BDR#0                Document Center                          1033       False
OFFILE#0             (obsolete) Records Center                1033       False
OFFILE#1             Records Center                           1033       False
OSRV#0               Shared Services Administration Site      1033       False
PPSMASite#0          PerformancePoint                         1033       False
BICenterSite#0       Business Intelligence Center             1033       False
SPS#0                SharePoint Portal Server Site            1033       False
SPSPERS#0            SharePoint Portal Server Personal Space  1033       False
SPSMSITE#0           Personalization Site                     1033       False
SPSTOC#0             Contents area Template                   1033       False
SPSTOPIC#0           Topic area template                      1033       False
SPSNEWS#0            News Site                                1033       False
CMSPUBLISHING#0      Publishing Site                          1033       False
BLANKINTERNET#0      Publishing Site                          1033       False
BLANKINTERNET#1      Press Releases Site                      1033       False
BLANKINTERNET#2      Publishing Site with Workflow            1033       False
SPSNHOME#0           News Site                                1033       False
SPSSITES#0           Site Directory                           1033       False
SPSCOMMU#0           Community area template                  1033       False
SPSREPORTCENTER#0    Report Center                            1033       False
SPSPORTAL#0          Collaboration Portal                     1033       False
SRCHCEN#0            Enterprise Search Center                 1033       False
PROFILES#0           Profiles                                 1033       False
BLANKINTERNETCONT... Publishing Portal                        1033       False
SPSMSITEHOST#0       My Site Host                             1033       False
ENTERWIKI#0          Enterprise Wiki                          1033       False
SRCHCENTERLITE#0     Basic Search Center                      1033       False
SRCHCENTERLITE#1     Basic Search Center                      1033       False
SRCHCENTERFAST#0     FAST Search Center                       1033       False
visprus#0            Visio Process Repository                 1033       False

So you can use the following command to create a collaboration portal:

PS C:\Windows\system32> New-SPSite -Url "http://<Your Path>" -Name "My Collaboration Portal" -OwnerAlias "<DOMAIN\USER>" -Template "SPSPORTAL#0"