Sounds like you need a GAMO! They start at $200, but will give you 1200 fps with their ammo, minimum, up to 1600 fps. Check LA Sportsman's classified. Precision air guns, air rifles, air pistols, ammunition and optics | GAMO USA There used to be a video of a guy dropping a pig at bay with one.
I've read a bit about those, they look promising. Gonna check them out at Bass Pro. Have you ever used one?
For even more fun, go get a decent paint ball gun and a bag of marbles. The marbles are the same size as paint balls and with the right calibration on the air will kill a squirril with a shot to any vital area. Takes a little more skill though. You can actually "curve the bullet" like in the movie wanted.
Depends on how many beers I have while we "hunt". I can imagine I might not be too much in the mood to clean em. Interesting tidbit - in La it was rare to see a fox squirrel. Here, it is even more rare to see a gray squirrel. They are all fox squirrels. Shall I send you a tail for your hat?
http://www.airgundepot.com/sheridan-air-rifles.html I have this bad boy. the silver streak. my dad bought it for me when i was around 8 yrs old. I killed just about anything with it. I also have the blue streak which was my dads when he was a kid. Both gun still work as if they were brand new and they have both been put through there paces mud, sand, salt water. I've killed everything from a black duck and blue wing teal to marsh hen, doves and squirrels.
If you could somehow aquire a remote controlled model helicopter equipped with rapid fire pellet guns it would be a hell of a lot of fun teminating the little bastards with extreme predjudice at close range
Better know how to clean them, they have a "stink" gland just like a skunck. Puncture said gland and you will ruin the meat. I had a .22 caliber Benjamin as a kid. Did the job just fine. Similiar to this one: http://www.airgundepot.com/?sb=newvisit