And here's a more base link if you want to explore the range:
http://www.galactic-intrigue.com/epicoll....es.htmlThe green and blue ones are the ones listed as MKI marines, the grey ones are sometimes the ones listed as MKII marines (but I have some grey mkI's I'm fairly sure...)
It's up to you what you like, but if you are saying to yourself "I can only get my hands on the MKI's" then you aren't trying hard enough. Once I actually watched ebay for a little while and had a bit of a look around the forums I realised that MKII marines are also rediculously easy to come across.