SLI will never become standard or become near standard.
This is what I would buy.
The PC
I know you said you wouldnt like watercooling but it will be much easier to do yourself really. You set up the components so you dont have to worry about 'a leak from a dodgy pump connection' 'cos you can fit everything yourself and make sure its all leak proof. Dont have to worry about crappy watercooling parts. Just buy the best you can.
The watercooling kit.
Swiftech Apogee GTX Extreme CPU block
EK-FC8800 8800 GTX - Acrylic
EK-NB/SB ASUS 1 x 2
ThermoChill PA120.3
Thermochill PA120.2
Swiftech MCP655-B™ 12 VDC Pump (No speed controller) x 2
XSPC Bay Reservoir (Black) x 2
XSPC 1/2" tubing x 20ft (just to be sure, if you make a hash at measurements etc)
12mm Hoseclips Pack of 10 x 2
YATE LOON 120mm fan x 5
Feser One - F1 - Cooling Fluid x 2 (et 2 litres of each just to be sure)
£473.27 inc delivery.
£2362.49 inc delivery for the lot.
Jobs a good en.