first--> is not a ds with 3d, is a completly new handheld console...this is because you say "i still have mi ds lite" also I have the mine but I bought my 3ds at launch date and i don't have any regrets at all...I play videogames like 5 hours at day, and 3 or more are on my 3ds..
Second--> If you are asking this, you really don't want a 3ds...is awesome, and not for the 3d, I play the games without the 3d on, a just turn it on for the animation sequences, is for the improvement in graphics, funcionalities and controls thats the reason is awesome.
Third--> Maybe you should wait until Nintendo release more games, is just too few good games, I have zelda OOT, Zelda link's awakening and ghost recon (and samurai warriors, but really I lose my money, it's boring)...this are the better games for me now, i just play this games (pass 100% OOT, i'm going to pass master quest, 100% links awakening, and 75% ghost recon but i'm going to 100% in ghost recon)