I don't know if you've made up your mind yet but I bought a .22 Marauder a month or so ago and couldn't be more pleased with it's performance. It seems many people have had pellet problems with theirs but I guess I got lucky - so far Ive been able get excellent results with a variety of pellets such as 13 grain JSB RS, the 18 grain JSB Exacts, H&N Barracudas, H&N Crowmags, H&N FTS, Beeman FTS, RWS Meisters, Superdomes, Super H points, Crosman premiers and cheapo Crosman "hunters" - and the list goes on. Obviously some are better than others - the worst Ive used were the 15.8 JSB's, Beeman Lasers, RWS Hobbys, RWS Superpoints, and H&N hollowpoints. Overall it seems like the heavier they are the better they shoot - one hole 8-10 shot groups at 25 yards are not uncommon when I pay attention to what Im doing - to me that's awesome accuracy.
Of course that is just my experience...velocities have been great and really the only problem Ive encountered is a slow leak - I contacted Crosman and theyve shipped me a replacement that is actually arriving today - I really hope it handles all these pellet as well as the first one. I cant tell you anything about the FX rifles, Ive never shot them but based on my experience with the Marauder I couldn't ask for a better rifle. I shoot it nearly everyday...it is a $%^&* to pump over and over but I welcome the exercise. So yeah thats my 2 cents...(or more like 10 cents I guess) good luck with your purchase!