Here are some great RPG's that I recommend checking out:
*Contact ($19.99): From the makers of No More Heroes, this title can be best described as a real-time version of Earthbound. The graphics are similar, the humor is intact, and while the crazy-unique design choices may intimidate (or even frustrate) casual gamers, hardcore players will get a lot out of it.
*Chrono Trigger ($40): This one isn't out yet, and will get more than enough press when it releases on November 24.
*Luminous Arc Series($20,$40): Not the most original set of SRPGs, but still fun. If you're short on cash, get the original, but the sequel includes a soundtrack that I'm personally looking forward to.
*Disgaea
DS ($30): Another hardcore SRPG. TONS of content, but can also be pretty intimidating.
*Magical Starsign ($10): A light-hearted traditional RPG that can get sorta stale near the end, but is still fun in the beginning, especially for the price.
*Puzzle Quest ($20): Just got it yesterday. It's pretty challenging, but still a blast to use Bejeweled gameplay to fight dragons and zombies.