The shop who quoted you $8-12k and says they are going to keep a log book and keep you updated sounds like a pretty reasonable shop to deal with.
There is a relatively good chance you will be disappointed in any shop you choose, depending on your expectations. I can almost guarantee you will be disappointed in a shop that gives you a firm quote as opposed to an estimate. At some point that "quote" shop will run into something that will take more time to do and will not do it because they will lose money. I never gave quotes to anybody on any work I did. I would give a reasonable estimate and I did my best to come in under it every time and I lost money many times because I wanted to be "fair" to a customer.
I am also a semi-bitter ex-restoration shop owner because I gave too many deals to too many people. (Insert Tongue in cheek emoji here).
Anybody who is willing to "make you a killer deal" will also disappoint you. Your project WILL wait at this shop.
My story follows...
My 55 Special was painted at a shop that was 60 miles round trip from my house. I was "quoted" $5k. I took it there with the chrome and seats out, engine rebuilt and firewall painted by me (with a small touch up gun in a garage). I drove there every weekend dropping off or picking up parts and small pieces. I helped installing glass. I picked the car up and drove it home after it was completed and I installed all of the trim, weatherstrip and interior. All said and done, the final bill was over $8k... but they stripped the car to bare metal, patched several rusted spots, painted the door jambs and dashboard. I was distressed that they went over the quote (more of an estimate, dontcha think?) by nearly half, but the car looked outstanding in the end. It was the best paint I saw on many cars I "competed" against. I don't think I could have done a better job at that point in my life.
The key to my story is that I established a positive working relationship with that shop and assisted without being a nuisance. We are still on speaking terms which is a different experience than I have heard from more than one other hobbyist.