Iceball: In an atmosphere, a particle beam is ridiculously inefficient. The problem is that any atmosphere stops charged particles very effectively (Electrons can only pass through 50 nm of ambient pressure atmosphere before half of them have been scattered.) This means you either need very, very high energy particles (penetration depth goes up with energy), or you need to push the atmosphere aside. In the first case, you're using way more energy than neccesary because most high energy particles will pass right through the target without doing a lot of damage. In the second case you're wasting most of your energy on getting your particles to the target in the first place.
BFEL: I would use ultrasound rather than microwaves. Prototype acoustic tractor beams have already been demonstrated:
http://www.nbcnews.com/tech/innovation/acoustic-tractor-beam-levitates-objects-using-ultrasound-n451666. In addition to that, using microwaves (or any electromagnetic waves) for tractor beams would require either radiation pressure, which requires a lot of energy for a minute amount of pressure, or it uses the principle of beamed propulsion, in which you focus the microwaves next to the target to create an explosion, which has the problem that it might burn fragile materials.
On another note, what do people here think about Electrolasers:
https://en.wikipedia.org/wiki/Electrolaser ? To me it seems like it would be more effective than long-range plasma cutters or particle beam weapons with the added benefit that you can have both 'stun' and 'kill' settings in one weapon.