To buy or not to buy?

I found a good deal on a new PSP and I'm considering buying one. But I've not heard particularly good things about the PSP in general, and I've already got a DS. However, there are several titles on the PSP that appeal to me -- mainly strategy and RPGs, but also games like Crisis Core and Chains of Olympus.

So, that said, is it really worth it to buy a PSP? How many really great games would you say are on the system?

Thanks.

i think its worth it cause theres alot of games and you can play movies and listen to music.