I'll just state the obvious:
FA 31 ltd
FA 77 ltd
then the less obvious
FA 100/2.8 macro - these guys I simply don't see in the marketplace or stores, and my copy is just a dream to shoot with
Tamron 70-200/2.8 - can't see myself doing away with this beauty
Tamron 28-75 - it's superfluous in my kit in terms of focal range coverage, but the FL range of this fine lens is just perfect for fast candid captures like in weddings.
then the unexpected
Pentax DA* 16-50 - yep, you read it right, my most used lens and by far my best ever in this focal range. Love it.
Pentax DA 55-300 - why? It's just so versatile and compact. I have thought a few times to sell it now that I have the Tamron 70-200 with a TC, but each time I do I recognise I'd regret not having the quality lens in such a small package.
In fact, I'd regret selling any of my lenses.