I'm lucky enough to own 2 FX Impact M4's - a standard length barrel version and one of the special edition M4 Micros. Both are excellent rifles. I've been buying FX rifles for 15 years and never had a problem with any of them, ever. I've had 8 in total and they have all been accurate, well built and faultless. I know others at the range who have the same very positive opinion of FX kit, so please don't be swayed by the few who for some reason seem to continually want to knock them. That being said, your list looks a little restricted if you don't mind me saying so. My Brocock Pathfinder XR is also an excellent rifle if you're looking for short and compact. I am very tempted to add one of the new carbine length HW110's as they appear to be a good choice. There are many great rifles out there that will do the job, but as has been said, I would handle them all before I spent a lot of money on one. Head to your local range and ask people who own them what they think, most will be happy to talk you through what they've got and many will let you handle and shoot them.