I think you should seek out some of those popular titles in the OJC bins (Original Jazz Classics reissues) before plucking down that huge amount of money for those 180 gm and 200 gm LP's. I have listened to both and to be honest I still prefer the original pressings to the pricey new releases. Lot's of the classic jazz and classical LP's are on very good vinyl. I still collect both original's and OJC's of any titles I come across mostly out of curiousity.
I don't know what part of the country you live in but you should become familiar with area Thrift Shops, Fleamarkets, Yard Sales and Estate Sales. This is where you will find a treasure of old LP's. Sometimes you will strike gold and sometimes not. Oh but the thrill of the hunt!!!
I have lived in Wahington, D.C., Texas, Virginia, South Carolina, Florida and now Georgia. I can honestly say I have picked up valuable vinyl in all those states. Washington, D.C. is a wonderful city for jazz, and classical. Here in Georgia the past weekend I picked up a copy of Monk and Coltrane on Jazzland in excellent condition along with a copy of Elvin Jones Putting It Away on Bluenote. I spent about $6.00 ea. Both have quiet surfaces with a couple ticks. I haven't cleaned either on my VPI cleaning machine yet. A record cleaning machine is a valuable investment for collectors. It will restore that quiet background on those used treasures you find. Providing it hasn't been damaged from poor tracking tonearm cartrige setups. It will also make the surfaces much quieter.
I strongly suggest you give those places a shot to see how many originals or reissues you will find and compare. Check out the local record havens that are still around from the 70's and 80s to see what they have too. There are thousands of us out there looking in those very places every day so why not join us?
It seems that you already know the labels to look for along with the artist. You may also want to check out wdcdradio dot com. They also list on Ebay and they sell brand new reissues starting at $7.00. Some are on 180gm vinyl starting at $9.00. Check them out. There are other sites like wdcdradio dot com that specialize in rock, jazz, and other genre's of music. You can normally recognize them when they advertise a New sealed LP under BUY IT NOW and for a crazy price of $9.99 or something like that. I have purchased over 2 dozen Bluenotes and other labels and I have yet to get one with a noisy surface.
I simply love the hunt!!!