I have an early 3GS running 3.01 with baseband 04.26.08

I had previously been advised to maintain this baseband to facilitate unlocking and jailbreaking. ( I wish to do both in the future but have no need for unlocking at the moment.)

In view of recent events (e.g. Spirit) is the early baseband still worth something?

I am contemplating legitimately upgrading to 3.1.3 this week and would like some advice in case doing so will close some doors on future opportunities.

Specifically:

1) Should I jailbreak or unlock first or will I still have option after I upgrade?

2) Is it worth doing something to keep the early baseband?? What?

Many thanks in advance!