Here's what I use -- all of it is easily removable except for the fork bag, which stays on all the time. I "mix and match" depending on what my plans are for the day and my guess on the weather.
(Apologies to those who've seen these photos before!

)
Dowco "Overnighter" tail bag:

Fork Bag:

Dowco from the front, with fork bag:

Small magnetic tank bag (Marsee Mini Bullet Bag):

Medium magnetic tank bag -- this one has an expansion gusset:

I'm not sure when I'll get around to converting some old leather briefcases into saddlebags, but that's on the "to do" list somewhere.