I don't mean to be negative - and hopefully this is constructive, but if you're going to the expense of hiring a RED set up, with lenses, drives etc - then why skimp on the editing and attempt to do it on your own system? Why not just hire an edit suite for a couple of days at a post house - plenty of fully equipped small independent set-ups that are very economical indeed + they have facilities to play your final cut out to tape or even arrange printing onto film if you need to - all in the same shop.
I'm an experienced director and have used RED several times, the first time I made the mistake of trying to edit on my home system (which is fine for regular 1080p/i editing. What with spending hours messing with getting the correct codecs sorted, then constantly experiencing lag from my disk set-up on fibre (that in theory should have been able to handle at least 2k) - I wasted at least a day.
Given my daily rate is around £1600, and I am currently swamped with offers - thats £1600 + the cost of the disk space I could have spent hiring a pro suite where they would have sorted all my media for me before I even arrived in the morning, leaving me 16 hours or so to sit and edit, glitch free. Add in things like the time spend running back and forth, mounting disks etc when you actually want to get you're finished timeline played out back to disk at the post house (unless you have a HD deck setup, which if you do I'm not sure why you're only able to spend $2000 on storage) - then it's a no brainer.
Also something else to consider - if you're planning on editing 4k - I hope you have a 4k pro monitor to select your shots on, else you'll probably find that if you watch in a cinema afterwards, or even on down-converting to 1080p, half of your stuff looks horribly out of focus and badly exposed. And again, if you have paid for a 4k screen then - man - why are you bitchen about a few more K on hard disks seeing as you must be seriously in the cash?
ALWAYS check shots, do colour work etc on a monitor that can display ALL of the pixels you are working with. Else you WILL get nasty surprises later...