I agree with the Pronto Pro 9600 advice. I've had a TSU7000 for 8 years and it's standing on one leg and beginning to look outdated. I have monitored Ebay for TSU9600s over the last couple months and you can score one for <$500 in very good condition. The RF Extender will run an addtn'l $200-400 depending on if you can find a listing together or have to buy separately. There is also a strong liking of the TSU 9400 and those sell for more than the 9600, typically on Ebay.
Good luck!