That pic is kinda deceptive, Viz. Most PS3 games don't use that cartoony style.
Honestly, Mupepe, I don't think a fully compatible PS3 is worth the extra money and effort to find it. I have the original 60gb PS3 and see little benefits from the 1080P upscaling of PS2 games.
Upscaled or not, PS2 games are still gonna look ugly on a HDTV. Especially if you have a LCD. If you want your PS2 games to look good, it's best to keep a CRT TV around.
Also, if the PS2 game already has native 480P rendering, then it will look much better with native 480P than upscaled 1080p.
Here is an IGN article that shows some comparisons between the various modes in which PS2 games can be displayed in:
http://ps3.ign.com/articles/793/793775p1.html"
Most of us here happen to prefer sticking with 480p when possible, but we're still keeping our fingers crossed that Sony will one day release an update that actually renders the games in HD rather than just scaling the image"