And the really messed up ones, they don't even give a landlord an option, per fine print in contract, they just go out and do whatever and send a bill after the fact. 

I don't have any brand preferences personally (I use Fantasy Spas at most of my units but I'm sure there are alot of reputable options), but just make sure wherever you place it is built to handle that type of weight.

Sales Tax Breaks: Construction materials and services may be subject to lower tribal sales taxes—or exempt altogether.4.

Quote from @Blake Winiecki: Figure out how much you want/need to earn, then reverse engineer it to see what options are available. 

Quote from @Heather Luu: Unfortunately, you would have to re-key the locks.Here's another option.

Regarding price, do you have any suggestions on how I can get him to agree to a lower price?

FYI, a 203k FHA loan is not a DIY-friendly option.

@Susan Tan you may also have lending options in the Houston area that offer 100% LTC financing for rehab projects.

Having the info will help you weigh the options and make an informed decision.

If you do have to move because of a job, you would be safest (in my opinion, i am not giving legal advice or financial advice), i would sell that property to ensure that you did not just purchase with the goal of moving out early and taking advantage of lower rates and lower down payments for purchasing your home as a primary residence.