Hiya
Regarding your other option, the Jaz Mirabel Beach, this is up at the Nabq Bay end of Sharm. I have stayed at the Red Sea Holiday Village (RSHV is very family orientated so good if you have kids, but not so great if you dont) which is three or four hotels away from the Jaz Mirabel Beach.
This is quite a nice end of Sharm as well, all the beachfront hotels have their own part of the beach directly in front of their hotels, with their own colour towels/sunbeds etc The beaches here are flat and not terraces cut into the side of the rock face like you get in some other places.
Its about 18 months since I have been but there are two malls in Nabq now one that they refer to as the English Mall and one the Egyptian so there are places to walk to of an evening after you have eaten if you fancy a change of scenery. There are a few bars and restaurants as well, but nothing on the scale of Namma Bay.
Most hotels at Nabq have shuttles into Namma Bay or you can just hail a cab from the main Peace Road, which runs across between the beachside hotels and their sister hotels that are on opposite side of Peace Road. It takes about 25 mins to Namma Bay depending on how quick the cab driver is.
Its quite difficult to explain how Sharm is laid out as from North to South it runs along about 40 kilometers of coast line, from Old Sharm (Hadabda), through Namma Bay up to Nabq Bay with a few other bays like Sharks Bay in between. Also certain sections of the coast you can only enter the sea from jettys out into deep water as you cannot tread on the coral as it kills it so it's illegal, thought I would mention that as I am not sure if its important for you to be able to enter the sea from the beach.
Hope this helps. Doe.