More bike tire questions

I've just learned to fix my own bike flats. I've also learned that my rear tire needs to be replaced -- I don't want to ride on something that's ripped up that badly.

I ride on sidewalks, paved roads, and occasionally on off-road trails. I mostly ride on level or slightly inclined ground. I weigh about 300 pounds and rarely exceed 10mph. My front tire is a 26x2.1 Ritchey Mega Bite Climb-Max. The bike itself is a big heavy Trek 800, so tire weight shouldn't matter much. The front has a Presta valve with a Schrader adapter, but it seems like a major pain in the ass and I don't know how or why I ended up with a Presta valve.

What would be a decent ($10-15 at Nashbar) rear tire? Should I skip mail-order and just get a tire at a local bike shop, and if so, what should I be looking for? And should I be looking at $40 tires instead?

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