Not Ranked
It depends on whether or not you *need* a 427 block. You can get to 427 cubes (and higher) with a run-of-the-mill 390 block. With your statement about considering a SBF that has 427 cubes, I get the feeling that maybe an original side oiler block isn't that important to you.
Turn-key 445ci FE's can be had at about $3k under your budget. To hit the 550hp mark, it will take some nice heads, a nice intake, and an appropriately matched camshaft.
If you want to hit closer to the 600hp mark, and be more on the streetable side of things, you will need some more cubes, which will indeed require a 427 block or an aftermarket block.
But to answer your question.....yes.
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