Honestly it seems like this horse has a lot of issues from your posts, if he is pasture sound I would turn him into a pasture puff. There is not a big chance of future soundness with the surgery so I don't think it's wise to spend all the money on a horse that will probably end up being only pasture sound anyway. But in the end it is your money, and your horse, but take it from someone who's been working to keep a TB gelding sound for the past two years. In the end I retired him (after thousands spent) and he is happy and sound as a pasture horse. Now I have a new gelding who I know his full history and is sound.
Sully ~Sullivan's Fly Supply~ [17.1 TB] RIP 2/24/14
Rio ~Camperio~ [18.0 Oldenburg]