Corey,
I don't think I'd jump towards the busman actives (or any actives) given the taping I think you do. Actives are great if you want to do discreet, low-profile taping. Say stealth or discreet FOB taping when you aren't allowed/preferred to be there.
If you get actives, you're probably getting less mic for the money than if you went with traditional full body mics. If you then use the actives to get into places in the venue to tape where you otherwise wouldn't, then the better sound in those areas will make up for the lesser mics. In your case though, I haven't known you to be doing a lot of discreet FOB taping or stealthing. For the bands you tape, and where you mainly tape (quixotes, cervantes, etc), you could just run far FOB if you wanted whether or not you had full bodied mics -- getting actives just doesn't seem to buy you much.
If you want to upgrade the sound from your mics, I might suggest getting something like AKGs (or get the Avantones busman modded, or just get full bodied Busmans and use the rest of the money elsewhere in your rig). For the AKGs, there is a set of 460/ck61/ck63's in the yardsale for $1000, including an active cable and a set of mic cables you don't need. If you can get the seller to skip those unwanted cables and sell you the mics and caps for $900, you could then sell your Avantones for $200 or so. Which seems to be about the same budget as the R44 -- I think that would give you a big step up on the mic side.
Or if you want to make doing 4ch easier, and you seem to be doing a lot, the R44 is a great choice. Normally my advice is to put more into you mics, not the rest of the gear chain. But you've been doing a lot of 4ch matrices and with the chatty CO crowds, esp in quixotes/cervantes, etc, the 4ch matrix using your Avantones is probably a very good bet.