Darren,
Mountain's edge and the far northwest seem to have lower price per square foot. I'm not sure how you'd feel about commuting from the way northwest? Mountain's Edge has been been inconvenient for many drivers for a while, but it has been getting better. Getting a good value in that area may pay off in time as more commercial/retail and road improvements help make the area more attractive. I don't think you'll get the most home for your dollar in Summerlin, but many are willing to spend more per square foot because they like the area.
This a a good time for buyers to get property with features like pools, upgrades and larger yards, which during a sellers market become scarce. You may also find good value in The Lakes near Sahara & Fort Apache although these homes are close to 20 years old.
Expect to find what you've described around $350k and up. Maybe $300k+ if you're also looking at bank owned homes.
Another agent here made a good point about talking with a loan officer as a starting point. Then you can work on finding the best possibilities within your price range.
I've set up a few property searches for you to view homes in several different areas. Let me know what you think. Click below to view the property searches.
http://botticelli.las.mlxchange.com/?id=31333931323130.353 - A few hours ago