Nice one Neil, always good to have something to look forward to! Would love to be back there this year but looking unlikely I think.
Definitely worth shopping around and doing as much research as you can, my only advice would be to always start with the hotel"s own website (provided you have decided on a specific one of course) as I find the majority of the time that"s where you actually get the best deal.
Not sure of your budget etc., but if you"re looking at MGM, take a peek at The Signature at MGM (white towers, gold windows, behind MGM itself). We stayed there last time, bit pricier than MGM, but absolutely georgeous, and connected to MGM via covered walkway. Quite good for couples I would say as you feel like you"re a bit away from all the "gaming madness" but you can walk to MGM in air-conditioned comfort in 5 minutes, or jump direct to the strip.
Hope you find a good deal!