not quite 165mm rear travel, but I reckon the titus El Guapo is pretty hard to beat. You'd have to build one up yourself, and they are out of stock at the moment (due to come back in stock soon). Despite people hucking the crap out of them, the web-reported breakages could be counted on one hand, and they are close to the lightest aluminium frame in that travel range (<3kg for frame+shock, actual). Proper FSR suspension, not super plush kind of suspension, but more responsive, and a surprisingly good pedaller, super lateral stiffness. You'd need at least a fox36, no need for a talas, or a 170mm lyric if you wanted it a little slacker and higher. The bike is pretty low to the ground, so it corners and downhills like a champ, but you have a few pedal strikes until you get used to it. Despite the official spec HA of 68, it is definitely closer to 67 with the "standard" fox36. When they are back in stock, you are looking at about $1350-1400 to get a frame to oz with a standard monarch rt3 shock (get them separate to make sure you avoid customs/gst). If you wanna go more towards the downhill end of the spectrum, people are putting push'd monarch "plus" shocks on them, and 180mm fox forks. I've got one set up as an all rounder at 13.5kg with a float36 and push'd monarch rt3, including a joplin and decent tyres on it (about 1.8kg of tyres). they are due to come out with a 170mm version of it soon (a 2012 model), but I doubt they'll get the geo/stiffness/suspension recipe sorted as well as this did the current one, which is the last titus bike that CHris Cocallis had a hand in designing, before leaving and setting up pivot bikes.
