I just got back from a week long 21st birthday trip to Vegas. My best friend got us a table at Tao at the Tao Beach level. We ended up paying $900 for a bottle of Bombay Sapphire and Patron with the tax and auto-tip. For what it's worth, all we did was call early in the week for a Thursday night trip and saw the front desk before 10:30 and they got us a table before we even picked bottles or paid. However, it wasn't on the dance floor. Our group was two guys and two girls.

If you are going with eight, I don't know if you're fine with it, but I would eat at Tao. Our group of four also ate at Tao and while we did order a bit, it ended up being around $300 after tax and tip. I figure if you double that for a group of eight, it'll be around $600 or $700, you can definitely get stamped into the club and ensure reasonable entrance especially for all guys and "save" $200+ depending on how many bottles you would have ordered.