If you are on a budget, X-arcade buttons and sticks are good, if you are a perfectionist, go with Happs.
The most noticable difference is the sound of the microswitches, X-arcade's are rather loud, but it's fine if you have big speakers on your cab.
Also note : the X-arcade buttons have a maximum mounting depth of 3/4", so if you are planning on using 1/8" plexi you'll need to build your control panel out of 5/8" material (5/8" + 1/8" = 3/4")
Craig