I'm in the same boat with my MX-700 remote (9 years old?). Select button is going. I haven't been able to find a suitable new remote. Options I've been looking into:
1) Buy a new URC remote. Nope, can't do that anymore, unless you want to pay someone else hundreds to program it for you.
2) Buy a Harmony remote. Nope, all the new ones have poor reviews, and you can't program macros.
3) Buy the discontinued Harmony One (good reviews, macros, $200 MSRP). Nope. Oh, you can find it on Amazon, but you have to be willing to spend $390.
I think I'll try punching through the select button to the enter button, or one of the programmable buttons, and hope no other buttons wear out before someone makes a decent remote.
Am I missing other options? Is there a good remote out there that can handle macros, and I don't have to pay someone else to program for me?
Panasonic TC-P60ZT60 plasma panel
Sony BDP-S5500 Blu-ray player
Arris DCX3600-M DVR
Yamaha RX-V650 AVR
URC MX-780 remote control