sdtv graphics question

I plan on getting a PS3 this summer, but I probably wont have enough for an HDTV as well, so I was wondering if the graphics on PS3 are still good on SDTV, cuz I've been a little worried about this. thanks.

It's like this. When you are watching a movie in normal resolution, you don't see the actor face full of squares. Now if you watch the same movie in HDTV you will see more detail.

With PS3 is the same thing. You get to see the graphics with a SDTV but you don't get to see the detailed that gives extra extra life to the game. HDTVimproves your gaming experience,but you can live with a SDTV (just like me)