Sheldon Cues
Sheldon Lebow out of Eugene Oregon has made quite a few and along with Bob Owen would be the two cues makers I am going to ask when I am ready to have one made (6'5"). There is a pretty lengthy post about longer cues that has been commented on today, but it sounds like you've got a good idea of what you want.
If you wanna try a dirt cheap extended cue, check out Schmelke cues. You could get a 60-62" cue, taper of your choice, laminated shaft for like $130, with joint, shaft, wrap options galore (their M series is cheap and has the most options). You could probably buy one for that, play with it for a while so you could get a feel whether 60 is going to be long enough, and sell it on here for $100 or close to it. Might be a nice investment if it would steer you a little close to your final spec's on a $1000 cue.