Try the indiegamer forums, Art Portfolios section. (forums.indiegamer.com) There's a lot of low poly work, but the artists on there are generally also capable of higher poly stuff.
3d modellers
Miscellaneous Forums/General Discussion/3d modellersThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.