First timer in vegas

[livinitup0]

I play a ton online but have only played at a casino twice, messing around with 3/6...they were horrible...it was great...minus the rake.
I play 1/2 6m online, which I know is probably much tougher than the normal 4-8 or 5-10 game.
Im staying at the Luxor 10/21-24, Ive got about 1200.00 for my online bankroll right now. I really dont want to take more than I have to from my bankroll.
Me and my wife only have about a grand extra in spending money after the hotel/flight. She said that she doesnt see us spending that much at all since two of the three days we'll be at a wedding/sightseeing, Most of the rest of the time will be for poker. (Including the wee hours of the night when shes sleeping...sshh dont tell) How much do you think I should take out of Bankroll vs. spending cash to be somewhat comfortable at 4/8 when Im there, I really want to be able to fully replenish my online roll when I get back. Im thinking maybe 2-300 from spending cash and the same from bankroll....Is this a bit thin for this level live for 2 days of playing? Im a decent player, just trying to figure out my odds on risk of ruin for the trip.