If your PC is pretty beefy (Were talking 4gig+Ram, QuadCore, 8/9series Geforce) get the monitor.
However, If your PC isnt pretty darn beefy go with a 360. 360 has a great lineup of games at the moment, aswell as some very nice future releases planned (FinalFantasyXIII for example) while the PS3's lineup and future release plans are looking quite terrible.
Saying that, PC > Console gaming if you have a decent rig.





