I think this:
The offer you have to take this six year old on loan is a good one, and it may all work out right.
But. Once you go down this path...you are already attached to this horse, and you have a strong relationship with the owner/breeder/trainer. Therefore your decision will be more emotional than would be ideal; you may push yourself to 'make it work' even if this isn't the horse for you.
So before you commit - check out the breeders in Sask as well as Alberta. Go and visit the Camrose breeder EVEN IF their prices seem high. A few day trips here and there will allow you to compare different horses and make a more objective decision.
I wish you good luck :) it's exciting for you!
On the money front - I think you have the funds. What you need to double and treble reconsider is this:
Owning a horse is a 365 day responsibility. They get ill, and they break when you are not planning it.
You will fritter away money on tack, grooming stuff, minerals, supplements, fly spray, and riding clothes.
You will have to chose whether you pay for veterinary insurance, or keep a slush fund deep in a bank account with a lock on it.
I keep my horses at home, so my expenses exclude any board fees. I spend $500 per month on my two horses and one donkey, excluding annual horse insurance, but including my trailer insurance. This includes a trainers fees once a fortnight.
This excludes my winter hay purchase which I hide in the household account....
I run a pick-up that tows my trailer. I bought a basic three horse stock trailer type.
I think the covers the payment side - only you know if you will be stretched if you take these funds out of your existing budget.