There are a couple ways to go here.
After thinking about it, I'll go ahead and use the DTM 5.3 for now. After I add the Behringer A500 to its Zone 2 pre out, the DTM 5.3 will take care of all the speakers I have inside the house.
This spring, when I add my outdoor speakers, I'll move The DTM 5.3 into my shop for a standalone setup with 2 pairs of inwalls and a sub. This will, in effect, lessen the amount of speakers that zone 3 originally had planned also.
Long story short, I'll need either a receiver plus amp(s?) or prepro plus amp(s) that can handle Zone 1(2 pair+sub), Zone 2(1 pair), and Zone 3(3 pair+sub).
If I use a stereo receiver, with true 3 zone capability, then I'll already have the A500 for Zone 2, so if I use a powered outdoor sub, I'd only need a 3 channel amp for Zone 3, right?
Budget~$1500 for just receiver/prepro plus amp? I have some wiggle room with that figure.
Thanks.