I know 15mm is a little more expensive than 6mm but I feel that the detail and overall look of these armies far out weigh this matter.
I have been collecting the metal for many years, I buy what ever I can on EBay and bring and buys, although 15mm is not that common.
On this stint at work I have done some fantasy work, although the minis are historical Achamid Persian, well Xyston Egyptian Marines painted as Stygian Royal Army, lots of red and gold!
Photos will follow.
As you may tell it's 15mm all the way for fantasy!