you should join Hua Hin Beginners & Locals - They will be able to answer most of your questions prior to moving to HH - very helpful and friendly group.
I agree keep the money in US bank and transfer $ each month to Bkk bank for spending money. Rent is cheap over here. I also read that you can transfer B65,000/month for spending money from overseas to Bkk bank about $2000.00 to renew your visa.