8km is fuck all on a mountain bike (or a road bike).
DISCLAIMER: Don't read the rest if you only want to spend $500.
Bosslady, at 5.8', presuming you're quite new to cycling, I'd be looking at spending around $1200 on a relatively light cross country bike with front suspension. I'm not against road bikes, but for a newbie their riding position is scary, and if you don't spend a lot of money they are REALLY uncomfortable on anything other than nicely paved roads. Road bikes are also too specific if you're just travelling that distance, so you may as well get an XC bike to enjoy off-road as well. If you really get into it, anything crap will quickly get on your nerves due to shite components.
Suspension: anything with anodised stanchions will be good enough and will last a relatively long time (just service them once a year or so). Chrome usually means cheap heavy suspension, and it rusts and pits within months. Usually crap dampening, leaving you with the equivalent of a 3 inch pogo stick. Rockshox are dependable at the cheaper end. Don't get Manitou cheapies. Fox will be too expensive. I've heard Suntour is upping their game too, but I don't think big brands OEM them yet.
Brakes: most hydraulic brakes these days will be by far good enough to do the job for a newbie.
Running gear: Shimano: Deore, SLX or above. SRAM: X7 or above.
Brands: if you're buying new, $1200 may get you a decent bike with the above components if you get a 50% off deal from Giant, Specialized or Kona.
Those are the most important bits. I'm speaking from experience, have played this game many times over 8 years or so. Don't listen to sales people either, get a really good idea on what you want to get first.
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