If you like your MX-1000, then email
[email protected] and explain the situation.
They'll give you a quote and then you can decide what you want to do.
If that doesn't work out, before you upgrade to a Pronto, check out the URC-200 and 300 reviews on this site. They can do a lot that your MX-1000 could never do, except for PC programming and graphical icons. They are, however, extremely easy to program without a PC program.
If you like programming with a PC, the MX-700 and MX-800 are, once again, much more powerful than the MX-1000 ever was.