PS3 probably would be the first to try to buy because it has the hard drive, but since I currently don't have internet at home there are 2 things that stopped me from running to the store to reserve it:
1) No internet at home, so I won't be able to download content at home (thought I play with the gamecube at work in the big projection screen )
2) the price tag :lol
Maybe I will buy a PS2 next year after the PS3 is out. Since I have so many PC games I am never in a hurry to buy new consoles.
About the PS2 with hard drive, I am guessing you meant the PS3 with 20 GB HDD