[pkautzsch]

Yeah, booming more than 2 people is an art. Well, actually, a craft. You can learn it, but it takes time. And you better concentrate fully on working the boom! That's why a sound department usually has at least 2 people.
BTW a good boom and shockmount helps a lot.

4 talents would, today, usually mean: 4 lavs + 1 boom. Muffled lavs are way better than rustling lavs. A little EQ (or a little more EQ) helps. Often one can hide them in a way the capsule just peeks out behind a button or in a tie knot. This works best with Sanken COS-3 due to their shape. If you know the script (and if talents stick to the script) it is possible to mix all lavs to one track, that's how they did it before portable multitrack recorders were available.

If you need really good wireless kits, it's Lectrosonics, Zaxcom, Audio Developments, in no specific order. But you're in with $ 1,500 for about one transmitter. Depending on where, how long and how heavily you intend to use them, the cheaper stuff can work too. Pitfalls are RF frequency choice (interference with other transmitters in busier places), self-noise, durability, diversity. I don't particularly like the Sennheiser EW stuff for the last three reasons, plus - any ENG team has them, so chances are high I don't like them for the first reason as well.