Replying to Street/dirt bike

hey all

i am riding XC-mtb for several years now (i finished 4th out of 5 in the tyrolean under 19 championship in 2005, which means i am damn good).
i like it since you really get to know your body when you ride a 4500 ft vertical climb, and downhills are sometimes very tech due to the uphill-oriented material.

over the last two summers i got into freeride/DH biking.
this is almost more fun, small drops, tech passages, speed turns and all that stuff is mad fun.

but now i am looking for a sport which i can excel in a city (beside urbans, i know). so skating, inling and all that stuff is cool, but i am used to ride a bike so i guess streetbiking would be slightly easier for me. were not having a dirtpark, but we have maybe the chance to build one...

i dont really know what kind of bike i am looking for. i wanna do the same kind of biking like the guys in the vids that throw 3s over stairs, clear stairs and even grind. doing manuals or 180s onto 1 or 2 stairs. maybe also this dirtjump-stuff, this 3s, supermans and what the heck...

so what bike is good for that? and how much i have to pay in this category?

thx alot
feihle