Howdy FTOsan, I have a black Ninja 250r to, great bike, you'll have a blast.
I have a full AreaP carbon fibre exhaust, love it. DAMN loud, though. They do a quiet core version, if I knew it was this loud I might have gone that. I got it delivered to Aus from california for $630 which is pretty damn good i reckon for a full c/f exhaust. I heard the yoshi twice in the flesh and didnt like it, to raspy, plus my stealership wanted over 600 bucks for the s/s slipon. The other exhaust I would recommend is the 2brothers which you could get for around the 550 mark delivered. my stealership wanted 1000 for that!!!

Felix