I was wondering if one or both of the cards have a reference pcb, because in the future i plan to maybe watercool with an ek waterblock. i was also wonndering if for the time being i should have the reference signature+ card or the non-reference signature 2. i wasnt sure if i should use the exhausting cooler or the cooler that blows the hot air back into the case. i will be useing the nzxt switch 810 case.
I believe this one is using a non-reference PCB: http://www.newegg.com/Product/Product.aspx?Item=14-130-...
It shouldn't be a big problem though, EK will almost certainly make a block that fits it.
I would go with it since it'll be quieter and is clocked faster. Don't worry about the air being exhausted into the case, as long as you have a couple case fans it'll be fine.