Well just a quick look at the prices for parts thru Xterraparts.com . You're looking at this much just for the parts needed.
Timing belt kit $271.70 at xterraparts.com
Manifold $64.79 at rockauto.com
So parts alone are $336.49
Price could be more depending on what else is needed to complete the job.
So quote price is $1150 minus the parts price comes to $813.51
Not sure what his going rate is but the $813.51 roughly works out to $85.00 an hour for 10 hours worth of work.
Now is that a fair price? It's not bad. But when you start getting into the $85 range your usually looking at what a Nissan Master Tech. would get.
Now another factor is how much is he getting quoted on for the parts? Is there anyway he'll go down on price if you provide the parts?
Oh and welcome aboard!!