Sonance, Triad and Episode are all good 70V speaker options. Personally, I'd stay away from Episode amps and use Crown Audio or QSC amps. Have used Lea Pro and Extron in a pinch which seems to be holding up.
Your goal here will be to figure out how many satellite speakers you want (although there is a way to design this properly) and at what 70V Tap setting you want to use. Then add up all the wattage per speaker. Then double that figure to get your amp wattage. Example, 8 speakers x 35 W Tap setting= 280 W x 2 (headroom)= 560 W, so use 600 W Channel. This could also be split up into 2 x 300 W channels with 2 speaker feeds. My personal system uses Crown DCI 4|300 (4 x 300 W channels), of which 2 channels are 70V for Sats and 2 channels are for subs.
Subwoofers are typically wired for low impedance ( direct wiring, no daisy-chaining).