From my personal experience, I recommend the WE M4. Good recoil and will hold over straight out of the box for quite some time. All you really need is an NPAS to adjust the fps and your good to go.
If and when the internals give up, replace it all with RA-TECH parts including trigger group, hop-up, inner-barrel, etc...
Should you find the recoil insufficient, you could try aftermarket buffers that claim to increase the recoil by "70%!!"
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