Should I buy This rig Or should I Wait?

cpu- i7 2600k
mobo- asus maximus iv extreme
gpu- PNY gtx 580 or MSI Radeon 6970 lightning
ram- corsair xms3 8gb
ssd- crucial m4 128gb
cooler- corsair h100
optical drives- lite-on blu-ray burner and lite-on dvd writer
hdd- wd caviar black 1/2tb
case- Cm storm Enforcer
psu- corsair ax850


1. gtx 560 vs 6970 lightning?

2. should i buy this or buy sandy bridge-e. Will SB-e be overpriced? looking at leaked info, i think so  

3.I willl upgrade to sli/crossfire later.

4. I will be using single 24 or 27'' monitor.

5. I will be gaming, hd video and photo editing, watching Hd movies/TV shows, multitasking and web browsing.