Noteworthy RPGs:
Tales of Vesperia (It was reprinted so its a bit cheaper, but still kinda pricey. But in the UK at least, you can get it off xbox live as a digital copy for £15. Bargain really!

)
Star Ocean: The Last Hope
^ Those two play much alike, so they are sorta JRPG but not.
As for WRPG, get a hold of a Fallout: Game of the Year Edition.
New Vegas is the newest and arguably the best, but Fallout 3 and its DLC makes for a looooong amount of playtime. (Though Dashing hates 3 so much! XD)
As for Sidescrollin' beat-em-ups, none come finer than Castle Crashers. Bloody good fun even for 1 player!
I'd suggest Majin and the Forsaken Kingdoms as well, but to be honest I have it, but never played it. (I really need to try that one. I hear its decent. Probably more marmitey than anything else though...)