Not tried Crab Shack, no prices on the menu and I fear it's well out of my price range. I saw a specials " A " board outside last summer and it looked astronomic.
Gets very loud there quite often, went with friends and we had a party of a dozen 40 something women all squealing and shouting doing selfies and squealing even more, awful night. Hence I recommended Salsa Viva, for its good food and a lot more intimate.
Salsa Viva the Mexican in the High Street opposite the entrance for the Guildbourne Centre car park is nice. If the evening goes tits up you only have a 2 minute walk to your car and if things go well you can get a room around the corner in Steyne Gardens.