They don't seem bad from what I've heard.... but for the same price you could get a Blackwidow Ultimate from Razer. You CAN'T go wrong with those.
http://www.razerzone.com/store/razer-blackwidow-ultimate
Yeah... I saw that. I read up and that means that Its either on back-order or not out yet. Phantek's actual site says you can buy it now, but I'm not so sure.
Yeah, the AX860 should be plenty for SLI-ing two 290x's. A little boost from the 760W to the 860W will make a difference later in the system's life.
Also.... I would totally go with the H110 or the H100i. They are both fantastic coolers.
Seriously? I've heard that the H440 heats up like mad due to the air suffocation from the front. I would definitely go for the 760t.
Also it depends on whether you want to build in a full ATX or a mid tower.