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KWA or VFC if you have the money. VFC being better externally, KWA is probably a little ahead internally (really impressive internals on their 2GX series)
King Arms if you are on a budget.
TM's were made for 300 fps. Nylon bushings, etc, need to be replaced if you upgrade the spring. Externally they are not as solid as some other models that I've named but they get the job done. They are expensive for their type, but if you keep them stock internally they'll never (almost) die.
If you are keeping your gun stock externally ICS makes a nice M4 that shouldn't be overlooked. One can be had for as little as 300, and the split gearbox design really makes them a breeze to work on. Downside is many of their parts are proprietary.
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