It's now a buyers market. Short sales, repos and new homes are just moving the market down about 1-3% a month. I sure don't think anything will slow it this year. For $300K I would look at something in the 89002 area. Over 2000 sf. 3-4 Bedroom and large lot. If you can wait a year...take a look back at the prices and you should see between a 10-30% drop in price for the Henderson Area.
Over the past 5 years Henderson has grown significantly and is larger than some out-of-towners think. In addition to a small, single story in Green Valley, you can get your hands on a very nice condo, condo conversion or townhouse - all in the Green Valley area. There are great deals with enticing incentives directly accross from the Green Valley Ranch Resort and "The District". If you're looking to live closer to the lake, you can get a 4 bedroom home with a large lot and RV parking for $300,000 or under!
You could buy a small 1,400 square foot home in a nice area called Green Valley right now. If you are talking about older Henderson, then you could probably buy a slightly larger home. Green Valley is a highly desired area, so $300,000 is basically the starting point for anything over 1,400 square feet.