For me - it's all the ones that I didn't see more.
Girls I never saw but wish I had:
1) Eleanor Aston
2) Verity redhead (the indie one not the adultwork one)
3) NewIndependent (was always put off by her prices, but compared to today's prices, she seems ok value now)
Girls I wish I saw a lot more of before they left:
1) Penelope - early 20s english studenty type with an incredible rack.
2) Hannah from Maxes
3) Lilly French Companion
So many more...