If you're after quality and a superior scope mounting solution you can't go wrong with an LRB Arms M25 receiver. I would have highly recommended going with a full build of theirs, but right now I would suggest one of their receivers combined with an I.D.F. parts kit, screwed together by a local smith if you lack the talent and tools to do so yourself. These parts kits won't be available by the time summer is here, and the last time they were imported was over 15 years ago, so you'll need to act immediately to take advantage of the ~$1,000 savings before your best option is once again a full LRB Arms built rifle. There are advantages of going for a full LRB Arms build: they build a great rifle on fully refinished parts, and their bolts are second to none in quality as well.
If you aren't looking to mount a scope, you can save another ~$750 by using a Norinco receiver. Some of us bought Norinco rifles back when they were $400, selected them based on the quality of their receivers, and are now pretty happy we did so.
Should you want to go the parts kit route, I have a fully matched HRA parts kit listed in the E.E. at my cost, and Wolverine Supplies is bringing one last shipment of parts kits in if you'd prefer to gamble and want other parts.