After receiving colour charts from both Craftmaster and International Paints and giving it some more thought I'm going with the latter. Good job I got the colour charts because as suspected the colours when viewed online are in some cases nothing like!
International even sent me some bigger samples/swatches which are actually painted rather than printed so you can see the actual paint and the colour which is great. The white I was originally thinking of is miles off!
I've got one of Dave's Huntress prototypes to compare colours against which makes life easier. The blue they sent me isn't quite right, bit too dark for my liking, so I've asked them to send me another one, after which I shall get the paint ordered.
I'm going for the Toplac Plus as the Toplac is being phased out and supplier stock is variable, and their OneUP undercoats.
Chris