My current spec is :
Q9550 stock
4 GB ram
Ati HD 4890
1920 x 1080
I dont think it takes much to run this game if you put on low/medium settings.
I run everything at max settings and I get around 40~50FPS.
Game is very smooth, no lag or anything. Unless you come at me with 200 units it wouldnt lag me at all.
As for the multi-player. Battle.net 2.0 is not that good compare to the old Battle.net.
The channel system are gone so you cannot chat and such.
But I play with my friends most of the time so is okay for me.
Just harder to *party* up with random people or clan-mate unless I add them on friendlist.
The match system is pretty decent. Usually match up with people around your level; not like the other player would rape you or you rape them :scared: !!
There are quite a few of custom games out there at the moment.
But majorty of them are very buggy and no complete yet.
I think in a few months time the custom maps will be much better.