I'm looking to get my first mountain bike since I got my drivers license 15 years ago! I'm looking for a CHEAP full suspension 29er with disc brakes that I can use to get into better cardio shape. It'll be used mostly on the street riding with my wife on her beach cruiser, but eventually I'll take it out onto some simple desert trails around the Phoenix area. I'm 5'8" 208lbs and haven't ridden in a long time! Right now I'm debating between a Mongoose Impasse R2780 (Mongoose 29 ER Niner Mens Full Dual Suspension Disc Brakes Mountain Bike Silver | eBay) and an Ironhorse Sinister 6.1 IH7082 (29" ER Niner Mens Orange Black Disc Brakes Dual Full Suspension Mountain Bike | eBay). I know these are cheap bikes with entry level components, but would either one be better than the other? I'm leaning towards the Mongoose for both looks and brandname from my 90's BMX days lol. Also, I think I'll prefer the twist shifter over the lever on the Ironhorse. Any feedback is greatly appreciated. Thank you!