You don't need overclocking. Can you do it? Can you watch the pc constantly? Checking for signs of instability? Basically, you have to babysit the pc or it may be permanently damaged. Best option is to get a cpu that has turbo. SB cpus aren't flawed, but the mobos aren't ready yet. AMD does have a Turbo cpu. The difference is Turbo is 100% stable & no need for babysitting the pc.
You don't need SLI for that resolution. It's for multi monitors or demanding games at very high resolutions. i.e. Crysis 1 & 2. If you really have money to blow around, upgrade that crappy LCD.
Why not ncix.com? They price-match anything that's in stock.