What size mountain bike should you have if you are 5"3 with a 29.5 inch inseam?

[Owlie]

Called the bike shop today. They are willing to take it back. They have only 1 or 2 15" bikes in the store at the moment so maybe that is why they were pushing the bigger bike. The 2012 model I bought can't be ordered and the 2013 model only comes with 29" wheels...so my next question is: pros and cons 26" vs 29" ???
Can't wait 'till this is over and I finally have a bike to ride!

I'm in the shopping phase, and everyone I talked to said "29er!" when I asked about what a beginner should use. The bigger wheel rolls over obstacles better, and they climb better and roll faster. In addition, they (coworker at the shop I work at, and the guy at another shop I went to) said that if you want to ride it on pavement, it'll do that better than the 26" wheels. (I've considered it for snowy bike trails!)The downside is that the bigger wheels don't corner as well. I should point out that I'm tall enough that standover isn't an issue.

I'm glad the shop was willing to take it back!