Alternatives to F13-F24?

[qwertyasdf-]

I have a mouse that has it's buttons mapped to F13-F24 and several hotkeys assigned to those.
I just received a new mouse that doesn't let me map the F13-F24 keys.
Does anyone have any suggestions for new keys I can use for the hotkeys? My goal is to assign keys that I would otherwise never use on a day-to-day basis.

[mikeyww]

You can use F1 through F12 in combination with modifier keys. Ctrl+Shift sequences also often work well with letters or numbers.

[rockitdontstopit]

Does anyone have any suggestions for new keys I can use for the hotkeys? My goal is to assign keys that I would otherwise never use on a day-to-day basis.

You can also specify "right" or "left" modifier key to effectively double the number of hotkeys available.