My current 6mm interests: orks, titans (chaos, ork and amtl).

I've also got future plans for tyranids, necrons, tau, squats, IG, eldar and dark eldar (basically all )

options:
1) Dark eldar raider - looted for my 40k orks (display army only now) with bitz for the chaos titans.

2) IG sentinal - legs stysem used as basis for titan

3) 5 possessed chaos marines - easy enough to modfiy into chaos knights, + chaos bits

4) Chaos termis - have to chuck an extra 8 quid in, but would work as basis for heavier duty knights / warhound

5) as above, but imperial marines for imperial knights

6) space marine dread (no chaos one available, 8 quid over budget) - used as basis for warlord titan.

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My shifting projects

hmm something dark eldar or necron seems a good bet, as lots of the parts from the 40k kits of the respective races are good for kit bashing epic scale proxies.

Current terminators are very big for knights, you could maybe use them for crusaders/castellans, but that aside a regular knight is more similar to a regular marine/necron warrior i think.

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AFK with real life, still checking PMs

Definitely Dark Eldar.

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author of Syncing Forward and other stories...

It's a dog-eat-dog world, and I've got my Milkbone underwear on.

The delfdar jet bikes seem to offer plenty of 6mm possibilities...