Hi, the only actual home miner for BTC (with latest chip version) is R4 (+8TH) from bitmain but be advised they are quite faulty and not small ( you know SMALL and FAST contradicts each other).
I would definitely wait for miners using Bitfury's 16nm chip ( but they are not on public market yet, maybe you could follow user sidehack. He's developing some ... currently a very compact miner called 2pac)
About scrypt miner I have heard about L3 (again bitmain). No personal experience but I've read it's not loud so much ( will try to find the reference )
Quite popular are also X11 to X15 coins mined with e.g. baikalminers (have no experience as well, do some search)
EDIT: here's the L3 ref.
So far it looks like power draw is consistent. Power use climbs as the ambient temps climb and the fan runs faster. And as I just reported the power use drops as the ambient temps drop and the fan speeds dropped. In either case even when the fan is running at higher speeds it does not ever really get "loud". I would say noise from the miner is on par with a GPU rig. So not loud at all really. ...
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