I like the early Miles, such as Dig, but you're hearing Miles in the process of figuring out who he is, and sometimes he's on, and sometimes he's not so on.
I found Original Jazz Classics pressings of Dig and Green Haze somewhere for not that much money (Ebay?) (meaning $10 - 12 apiece--and this was in the last 6-8 months). Assuming the Japanese pressings are expensive, you might test your reaction with some US pressings. I've generally been happy with the OJC pressings. They're better than the Two-fers that came out in the 70's (which are also not hard to find...disappointing transfers, though).
I found Original Jazz Classics pressings of Dig and Green Haze somewhere for not that much money (Ebay?) (meaning $10 - 12 apiece--and this was in the last 6-8 months). Assuming the Japanese pressings are expensive, you might test your reaction with some US pressings. I've generally been happy with the OJC pressings. They're better than the Two-fers that came out in the 70's (which are also not hard to find...disappointing transfers, though).