$2k is way too much. After checking HD, go over the prices with the builder and see if there is not some mistake.

Also, you say you are leaning toward a 1 1/2 HP pump. Is that an uprated or full rated pump?

I guess I missed the spa before but a 1 1/2 HP uprated pump may not be enough for the spa if you are using a single pump or are you going with a separate pump? Each jet should have about 15 GPM to provide enough action. That is 90 GPM and if you figure on 60 feet of head for the spa, a 1 1/2 HP full rated Super II pump would only provided 12 GPM at best. Modest jet action. Hopefully, the builder will be using at least 2" piping for the spa.

So if you are going with a single pump, a 2 HP full rated 2 speed may be a better option but you should go with at least 2" plumbing. Otherwise a two pump solution may be better so you can get a low HP for the pool (3/4 HP) and a higher HP for the spa jets.