I see what you mean about mopping up KZ2 online before KZ3. I have the same dilemma with Skate 2 and PES 2010 as their sequels are already out, and I have games like Uncharted 2 and BioShock 2 (that I haven't started), but their sequels are out in coming months/years. I hear that Heavy Rain can get a bit boring with time, so I see what you mean. I'm at 10% of the way on the road to reaching the highest rank in GTA IV. I really don't have much time now as I'm barely in the house because of school and settling down here.
Awesome! You have a nice streak going.
I was able to get the hardest and most glitchy trophy which is called Auf Wiedersehen Petrovic. Look it up here.
I basically have to do like 50 hours of grinding to reach rank 10 and get the platinum.
I hear that RDR is a DLC-fest so it might not be the best option for you, and I hear that one of the DLC is pretty tough.