The Mellotron Group

Just trying to get opinions here. For those of you with more than one violin sound, what are your thoughts on having both MKII and M400 violins? I'm just trying to decide if I should have both types (one each between 2 frames) or just choose one (MKII seems to be prefered) and free up the last bank on the 2nd frame with something else (like oboe). Here's what I'm thinking:

1st frame:
Cello
MKII violins or M400 violins
Flute

2nd frame:
8 choir
MKII violins or oboe (or something else?)
Brass

If one has MKII violins, will he ever need the 400's? Or do you just use the MKII's and dial the tone control back? The tradeoff I see is not being able to blend the brass and choir with a string sound which is certainly a big plus. However, I don't want to waste a bank on a sound I won't use. And that Tangerine Dream oboe is really cool, right?

Guide me all you Mellotron Yodas out there.