As far as financing goes, there is many options out there to choose from currently and interest rates are great! Make sure you find a REALTOR in your area that knows your goals and will price and market your home to try and sell it and get you here to Troy.
If your hoping to look sooner than later in Troy and find something you like, you always have the option of writing a contingent contract upon the sale of your property in Las Vegas.
If you do not already have a REALTOR in Las Vegas and are struggling to find one you are happy with, Coldwell Banker Heritage Realtors in Troy can get you working with our Relocation department and help you find a REALTOR in your area and then assist you later on when your ready to start looking in Troy.
If you have any questions, please let me know! I'd be happy to help you however I can!
Good answers so far but here are a few point for you to consider. Like Sandy said if you can buy without selling then there is no problem... If you must sell first then you will need to have a contract showing an accepted offer on your existing house. That way the lender will start the underwriting process on your new loan, but you will have to close on the old one before you can purchase the new one.
You said you will be putting your house on the market out in Vegas. I have several great agents the work in your area that I would be happy to recommend one of them depending on what part of town you are in. Just let me know if that would be helpful.
Finally, for your move here, if you click on the link below you can start doing some searching around and get an idea of what homes are selling for etc... If you need school reports or other information about the area please let me know as well, we offer a pretty extensive relocation package that we will express mail out to you if you would like.
Best of luck to you and hope that helps some.