Just to add to what Rakuho said, there is at least one PS3 game (Lair) that you CAN play on the psp via remote play. Not sure if there are more or if they plan to make anymore though.
There was some talk about a patch that required the RB1 disc comming out somewhere down the line but I'm pretty sure that was just a rumor. You should be able to rent it and export the songs to your HD(which is what the key does).
I would never discourage anyone from buying a PS3 but once you play games on an HDTV you'll wonder how you ever lived without it. I'd say get the PS3 then save for an HDTV.
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