[Kos-Mos]

A LayLax 210% with a good compression group will net you about that FPS. It will be hard to pull, but not impossible. I am not a big guy either and I was able to pull it. After a full magazine, my arm was getting tired though.

But if you have to choose a gas rifle, go with the Tanaka. After the mods, it is a VERY good rifle, especially if you run it on an external air supply (CO2 or HPA). You need to have a low pressure regulator installed at your bottle, then run the line to the side of the magazine (with a 90deg QD joint). That will let you get in a decent range of FPS and the magasine chamber acts as an expansion chamber, so you get more stable FPS. HPA is not necessary as the pressure used is way lower than what is used in paintball, making the gain from CO2->HPA useless. You can easily run a macro line in your sling (4mm line) and have a QD connector at your magazine, with a cut valve on the line. It will let you either use a few different mags or reload one mag with a speed loader easier. You would also be able to still use propane or duster in the magazine for lower FPS games.

With the Tanaka running on an external air rig, you won't need a PCS equipped one, but you might want to do the nozzle mod to allow more gas to pass and require a lower pressure from the tank, since you can manually adjust the FPS from the regulator directly.