Unless you have endless tricky and tight switchbacks, I think the 29er will do just fine for you. The only time I have ever wished I was on a 26er was when I was riding in Colorado where switchbacks were frequent and tight.

I had a Myka (26er) as my first MTB. It was the gateway drug!

I'd recommend you get the best brakes and components you can afford. I had lots of trouble getting cheaper brakes to stay adjusted and quiet. I've found with more advanced brakes, I never have a problem.

I also notice that 10 speed is way nicer than 9 speed, which is way nicer than 8 speed, etc. Those extra gear ratios are very very helpful with climbing. I personally don't have the power to just push a higher gear at times. Having the RIGHT gear available can make or break a techy climb for me. It's not just about the highest and lowest ratios available, it's about having smaller increments between them.