OES11 + GW2012

QuadCoire Xeon Server with 8Gb Ram, 600Gb SAS RAID-1 using Hardware RAID
25 User - PO size ~ 100Gb, Archive ~ 100Gb

NSS or EXT3

Server will be used for GW only (including GW DMS with DOCS stored at PO)

Apart from NSS offering supported GW Archiving - is there any reason to use
NSS for main GW PO/Domain ?