EPM.....How many Opinions do I need?

Question
  A little background: I paid $600.00 for a 5 yr old Paint horse that was fed dogfood for 2 yrs, this happened over 2 yrs ago so he's been on regular food for a good amount of time although I feel you must know that the other horse that was with him  did die. I've had him since 08/21/06; One Vet/Chiropractor thinks the horse has EPM sees uneven, weak hindquarters, $120.00 vet fee; another vet is then called for a second opinion; he does similar tests and says he doesn't think so, said he would do a blood test if I wanted but he doesn't see anything obvious. This last vet is very well respected and been around a bit longer so I thought I was Ok to go forward with his training. He told me that anyone could find something wrong with a horse if they looked hard enough and that no horse was all even everywhere and I would be better off spending my money on a good trainer, another $130.00 vet fee.           
     A farrier came out today to balance his feet before I sent him to a local trainer, he bucks.  Well the farrier said he was just offering his opinion but thinks he might possibly have EPM also (he is Associates w/the first vet of course) but says that he walks on his right back foot "heavy-footed" ... says his right hip rotates awkwardly, I don't see that either!!  I am no stranger to a horse walking in an 'OFF' way I muck stalls for a larger ASB stabel here but I cannot see any of these problems they see and of course now I am hyper-focusing on his hindquarters trying to see what they do. Then yesterday I saw him stop suddenly while he was vigorously eating and look like he was going to fall asleep all of the sudden which is odd for him so I thought OH NO....then he just started eating again.  See now i'm over analyzing everything he does.
     How many more Vet opinions do I seek, how much more money do I spend on opinions? I guess I could have almost paid for the $500 Spinal fluid test by now.....jeeze!  I have kids and a family. Yes I do know the only sure way is a Spinal fluid test but I don't have the money....
I called K-State and talked with a Dr. there and she said she was confused why I was calling because my horse has no obvious physical signs he never stumbles, looks unbalanced or any of the other EPM symptoms. I have been doing ground training EVERYDAY since I got him, I have seen him every single day!!  I told her all the opinions/stories and she said just watch him and that I could get a blood test but 50% of horses will test positive for it that way and that does not mean they have it.......
        Bottom Line:  Is it possible for me to wait another 2-4 months and watch over him to see if anything further develops and if nothing does COULD IT STILL LATER  DEVELOP or could I be OK?  I'm not going to hold your opinion against you.....everyone I know that's had a horse with EPM say its very, very obvious physically and it comes on fast.  The Dr. at K-State said the only consistent thing about the disease is that it is not consistent......WOW!!!   

T

Answer
I AM NOT GOING TO OFFER ANOTHER OPINION, AS I'VE BEEN LUCKY ENOUGH TO AVOID EPM AND AM NO EXPERT IS THIS AREA.

I DO KNOW THAT VETS AT THE TRACK WILL PUT A HORSE ON THE EPM MEDICATION IF THEY SUSPECT THE HORSE HAS IT. IF IT WORKS,  THEY CONCLUDE THE HORSE HAS IT, IF NOT THEY LOOK FOR SOMETHING ELSE.