Hello mzh,
I have a Burris 2x7 Scout Scope mounted with Burris Extreme low rings on my Scout Squad. The rear bell of the scope sits about 3/8" from the flat part of the receiver. Scope and rings were less than $500 from Optics Planet. I tried an ULTIMAK rail to replace the stock rail, but then the scope was actually touching the receiver. The addition of the ULTIMAK would put you over budget anyway. I'm satisfied with this set-up, so far. Hope this helps.
I have a Burris 2x7 Scout Scope mounted with Burris Extreme low rings on my Scout Squad. The rear bell of the scope sits about 3/8" from the flat part of the receiver. Scope and rings were less than $500 from Optics Planet. I tried an ULTIMAK rail to replace the stock rail, but then the scope was actually touching the receiver. The addition of the ULTIMAK would put you over budget anyway. I'm satisfied with this set-up, so far. Hope this helps.