Diamondback Mountain Bike Upgrades

Mountain Bike selection advice?
I recently returned to riding my mountain bike…sat out many years and now have the bug again. I have been riding a diamondback but obviously am in need of a SERIOUS upgrade. I am riding moderately difficult trails hoping to advance to the tougher trails this summer. SO…i need an upgrade and am only capable of spending up to $800. I am searching on-line and have gone into my local shop…just trying to compile as much info as I can before I purchase. I was wondering if anyone could recommend a bike or two for my needs. Thank You in advance.
I think for $800 you should look for something used on craigslist. You can’t really get a decent new mountain bike in that range, but you can get a pretty decent used one.
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