My current .204 is a Vanguard that has a custom McGowen barrel and JARD trigger. It is out of your price range. I would not build on the Vanguard again.
I have had Ruger 77 stainless. You will never reach the lands, the trigger will need work or replacement, the rings will need lapping and it never grouped near or under an inch. The stock does not have enough comb to allow you to see through a varmint scope. I put on the rack at Cabelas.
I have a Savage Model 25. It is throated so you will never reach the lands and still fit the cartridges into the magazine. The magazine was designed for .223 and really is short of what you would design for a .204 Ruger. It will fit some factory cartridges. I tried it in the showroom. The plywood thumbhole stock is great with a scope. It comes with Weaver bases which allow you to use very solid rings like Warne. The trigger is about 3 pounds at minimum adjustment. I replaced it with a JARD. It is in your price range. The barrel is pinned in place not threaded. The bolt is a modern design of 3 front lugs like the Browning A bolt or SAKO 75 and 85. My bolt face was rough and machining not what you would want. The barrel seems good. I can get about 3/4 inch regularly with R-15 and 40 gr Hornady seated to the magazine length. I have not developed a 32 gr load.
The CZ 527 looks great to me but the safety is backwards, backward to fire forward is on safe. The stocks are too low for varmint scopes. The high rings that come with it need lapping. Aftermarket stocks are few.
I have a custom single shot Model 700 with PTG bolt at Truetec for nitrocarbuizing currently. It is a .20 PPC. More on that soon.