im looking at a new bike at the moment but i dont realy want to go with the 150 as they havnt proven them selves yet as in like there new and we dont no how long they will last etc etc etc
i would say pit pro they just look a little better and i havent ridden the nitrous but every one says there suspension is crap but choose what ever IMO pitpro is a bit better
Go the Pitpro XR150, i have one and there very reliable if you treat them right. Regular oil change and airfilter clean and it will last.
Mines first kick or second kick.
Suspension on the PitPro is average but, good value for money. Not sure about the Atomik i have heard they are getting better and more reliable, but at the end of the day you get what you paid for. So dont expect anything too fancy.
EDIT: Look into DHZ bikes aswell as they have good quality bikes and great costomer service. MRs are always advise to go DHZ. But at the end of the day i guess its up to the indervidual.