I shot there just about every Monday last season, Scott runs a great little thing there and it's good clean fun. I personally don't feel a spotting scope is a MUST for 600 yard F-Class, in fact the spotting scope is only ever used by your score keeper, you should be able to see the scoring and marking disks just fine with whatever optics you are using provided they are in 15X+ range, and even then I know I can see them with my 10X stuff. Also just about everyone there has a spotting scope, you will likely be scoring for someone who has theirs setup and normally they don't mind you using it because you are after all scoring for them. At any rate when I do bring one out I normally use a $70 Barska, it works just fine, you are not looking for bullet holes, just scoring disks and shot markers, both of which are about 4" in diameter. Starting out I would spend as much as you can on rifle optics and rifle and worry about the spotting scope later, I've used my buddies $3500 HD coated Zeiss, for F-Class scoring at ERSC it makes no difference from my POS Barska.
I happen to run a few Savages for long range play, just picked up another virgin target action yesterday from Jim Briggs at Northland Shooters Supply out of Buffalo (shameless plug for a good guy) to use for this year’s F-Class rig. What are you planning to run for a barrel and stock, is the action you got one of the Precision Target unit with the lightweight accutrigger?
One thing I will stress is weight, if you are shooting a 308 get that moma as heavy as you can, I think FTR is up around 18lbs and open is 22lbs or so, you will be doing yourself a favor by making your rig as close to that as you can. Also if you are indeed shooting F-TR you will really want to get an F-Class specific bipod (looks nothing like a std bipod) it makes the experience much more enjoyable, not that a Harris won't work (I used one half the time last year) but the Sinclair unit is nice and there is a fella at EREC that makes a copy of it for a bit less, lots of guys run his unit up there. My go to rig is down with a shot out barrel so I've been shooting a Savage 308 10FCPHS in some local 300 meter matches and despite the rig weighing a solid 12.5lbs it jumps around ALLOT, a 175gr pill leaving at 2700 FPS has a bit more recoil than you would think, trying to hit a 3" X ring @ 600 yards is a bit more difficult then putting one in Bambi’s heart @ 300.
At any rate it's a great time, I just got into it last year and it's now my most active area of shooting, let us know what you're building!
Also if you are looking to get some nice off season shooting in check out the MRC Monthly matches, heated building, electronic scoring targets, pretty nice deal if you wan't to keep pulling the trigger even if there is snow, the group is almost all F-Class with a few HP shooters here and there
http://www.mrra.org/int.htm