Nintendo DS newbie and.....

Well I just bought a Nintendo DS yesterday, after 3 months of constant unlucky search (it was sold out everywhere), and I am happy to say that I am loving every second of it. I bought the New Super Mario Bros. game, which is amazing but I am looking for new games to buy, what games do you guys recommend me?

P.S. I know that you may be bored to read another "what games should I buy" topic, but I am truly new to the DS and to the handheld console market, this is my FIRST handheld console I have ever owned, so I practically don't know what games are out there and specially which are the best!

Thanks for the recommendations guys! I will check out these games and see which appeals to me the most. How about the Castlevania games? I have always loved these series, I see that there are two for the DS, down of sorrow and portrait of ruin, are they any good? which one I should start with?aemena

Thanks for the recommendations guys! I will check out these games and see which appeals to me the most. How about the Castlevania games? I have always loved these series, I see that there are two for the DS, down of sorrow and portrait of ruin, are they any good? which one I should start with?aemena

Dawn of Sorrow  had the higher rating, i own it. but i dont have portrait of ruin yet so i cant really compare other than that.

new super mario bros.
yoshi's island ds
elite beat agents
brain age
castlevania: portrait of ruin

imports: jump ultimate stars

I also just bought a DS (my first Nintendo handheld). I suggest looking at all the GS reviews for a start. You can sort them all by highest score. Read/Watch and decide from that. Don't neglect the GBA catalog, since this is also your first Nintendo handheld.

I recommend Mario+Luigi: Superstar Saga (GBA) and Partners in TIme (DS). They go together well, as do the Yoshi's Island games for each platform.