What's your budget?
You say you want accuracy but you want to keep the price down. You sound like a semi could be an option but maybe a repeater would be better/cheaper... Why people bring up weight when comparing .50's is kinda funny, they're all HEAVY!!! If you complain about a hunting rifle being heavy at 7 pounds, a .50 will never fit into your shooting lifestyle. If you think you're going to be trekking through the woods with a .50 strapped to your butt, not happening. They're made to be pulled out of your vehicle and put on the bench at your local range!
Windrunner 50's are awesome but Bill died a few years back, not sure what they're status is now. His son I hear is taking care of customers and he builds his own firearms. He's probably better at it then his dad was and I would seriously check out his firearms. You can see them at
www.vigilancerifles.com not cheap but quality never is.
The AR-50 is the AR-15 of the .50 world, plenty of aftermarket accessories for it. It uses a Rem 700 type trigger, you can drop in an aftermarket one and have a smooth as glass trigger. Swap out pistol grips, bipod... you name it. It will shoot MOA or better with quality ammo and the person pulling the trigger doing their part. So if you don't need a semi or a repeater, the AR-50 is the best way to go.
The Tac-50 would be another good choice if looking for a quality repeater, they've been making custom 50's for a long time and know their business. This pushes the budget up to at least $5K for just the rifle without any extras.
If you want another choice for a semi, look at Serbu's BFG-50A. It smokes the M82 all week long and twice on Sunday's. Mark is an engineer and knows how to build a firearm, plus if you call the shop, chances are he might answer the phone! If you talk to him you'll probably end up buying either his semi or single shot BFG. So have your credit card handy...
Don't know what else to tell you other than buy a quality scope. No, I don't consider the super sniper a quality scope but it will do in a pinch while saving up money to buy one that you want. You have to remember that the .50 is capable of hitting targets out to 2000+ yards, why spend top dollar and then put glass on it that can't keep up?