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My favourite are my F2000 twins. Solid, extremely quiet, adjustable fps, have good range, and take m4 mags. The F2000 has a nice cycle rate too. Mine average around 14-15 rounds a second / stock gun on a 9.6v. I have a P90 as well which is very nice, and performs just as good. Echo1 socom 16's are very nice as well. They don’t take m4 mags, but are very solid, and I can't believe the range and accuracy I get with it. I wasn't sure when I was buying it, but fell in love once i used it. All 3 should be in your price range, and I recommend them from personal experience.