I take it that you are looking to buy new???.
If so why?, there are plenty of second-hand bargins to be had and for $1150 you can get a lot of marker for your wedge.
I would recommend going to a site where a lot of walk on players go and asking for a quick try of their markers, un-beleivable as it may sound most players will be happy for you to have a go of their $1000 + marker. this way you can find out which marker you like the feel of.
One word of warning though if you are going to upgrade that Jt excellerator at the end of the day it is only a blow-back spyder clone and thus will have all the problems associated with this range of markers, no matter how much you spend on it.