There's a few general common sense rules you can follow...
1) stuff that needs a good signal for tracking purposes (envelope filters, octavers, tuners) work better up front.
2) Modulation stuff (chorus, reverb, delay, etc) work better at the end so the other effects can go into the modulation.
3) Anything with a DI works best at the end of the chain, again so you can get other effects in front of it to send out to the board. If you're using the DI on your Sansamp, anything you have after it won't go to the house PA.
4) Effects order is all about personal preference, there aren't really any set rules. Try different things, experiment and see what works best for you.
If I were working with that list, here's the way I'd set it up (but again, this is just personal preference):
Tuner > ODB-3 > Guv'nor > T-rex > MXR > #1 > BDDI
5sg.