I'm definitely planning on picking up the avatar eventually. But from what I've reading there is a lot to be gained from playing with Ramos sans avatar to learn how to use him well. From what I've been reading the Avatar plays very differently and I want to learn all the options.
Arachnids are not going to be all that hard to come by. After getting the avatar I'll have 4 Swarms, which I doubt I'll ever actually use in a single game. And the way I'm modeling them, with magnets, there's no burning need for more models beyond what I have.
I 'm kinda looking at collecting M&SU members and assets (other than Collette... She's not really my style) as a general theme to my crews. Ramos, Mei Feng and Kaeris and their crews will all eventually get added to my pool of minis.
-DavicusPrime