In terms of MOSFETS, you can go two ways: 1) Build one yourself (If you have enough elecs experience and all the parts required), or 2) Buy one.
In terms of buying, I personally like the Gate GDS-4005; It's a basic FET, comes with all you need, and only costs around $20.
More Hi-tech is the Gate MERF 3.2, which is a designated AEG control unit. It's programmable, has arc control, handles high-voltage, high-drain situations extremely well, and is basically a FET god. However, it will run you around $70.
AWS makes some of the best MOSFETS out there, but they're pretty expensive for the good ones. Their RAPTOR FETS are basically the most widely accepted top-tier AEGCU, but they cost over $120 per unit.
Do some research, and I'm sure you'll find something to suit your needs.
