Well i've said this over about 5 db forums, and probably good to reiterate it all the time ...
Polycounts of games aren't the most important aspect!
They're also NOT the biggest speed killer!
In general your game / program should balance out to what is comfortable on the system you choose as the min specs your aiming for.
300Mhz | 64Mb Ram | TnT2 16Mb isn't going to be able to process or handle the same amount of polygons that a 1,000Mhz | 512Mb Ram | GeForce4 64Mb could!
So trying to note set polygon counts arn't really worth it, especially considering I know that if you can get say 20,000 on my screen at one and make it look gorgeous, yet plays like a pig and the people arn't so stupid that even my 5year old cosion can outsmart them - then ya know i'm not gonna be wanting to play again
Now when DBpro was in development there was ALOT of hoopla about "oh it can handle 10x the polygons" blah blah blah...
to be honest, I'd rather keep with the sensible polygon count and make my characters smarter, or setup better collision and particle effects. All the things that in DB would slow it to a crawl you can now do!
If I were you depending on the game your making aim for about 6,000 polygons onscreen at once ... this is EVERYTHING onscreen. Perhaps once you get the rest of the game all coded etc, THEN up the polygon counts until it starts slowing down uncomfortably.
Emphasis should never be directly on the graphics of a title, they can be tweaked and updated once you have a working title.
My system with DB can handle almost 150,000 polygons untextured without slowdown at 60fps
Just becuase it can handle that doesn't mean thats your aim! Textured Polygons render at almost 1/4 the speed, transpareny half of that... add Ai, Networking and Physics, before you know it you can only have about 1,000 onscreen at the same speed!
Read the post at the top on newbie starting places, the polygon counts are dictacted by the engine not the other way
Valve ERC, Polycount and Barking Dog all have documents on the perils of polycounts in game with more depth if you need more information.
"For the Greater Good"...
Kyi'Aun (Jedi Master) Rai'Ka