PS3 is looking good for this year...
Playing inFAMOUS now, picking up Cross Edge tomorrow. On the 2nd Fuel and Red Faction. Come the 9th it will be time for Prototype. 16th is Ghostbusters (may bargain bin). 23rd is Overlord 2, Transformers 2 (may bargain bin), and Dynasty Warriors 6 Empires (which will dominate my time for 30 days at least). The 29th Fight Night Round 4 and the 30th is Call of Jaurez: Bound in Blood (this looks really good). That's some serious releases for June (there were more but only these interest me).
There are like 10 PS3 games released in July, but only 2 interest me, NCAA Football and Wolfenstein (which is good, will give time to play all the June stuff).
August is slim with Madden and a few others.
September to 2010 is insane with 57 new games! Some may get pushed in to 2010 but that's a ton of games! Little over 14 games a month average during that time as dates look right now.
I would wait for E3 to hear what is announced before making a major purchase. If I were buying a PS3 from scratch and had to buy it today, I would get the 40 gig with the smallest chips architecture and slap a 500 gig HD in it. Lower failure percentage on components, much lower power use, and they have gotten better at keeping stuff cool with a lot less vents (better Blu-ray drive set up too).
PS3 resurgance by GOW3 - Check! Mass Effect for PS3 - Check! Diablo 3 for consoles? I say "For sure"!