1) Get the all-in-one and do yourself a favor and pick up Ravyn and at least one Houseguard Thane to upgrade it.

2) If you like eVyros (who I personally feel isn't as good as Issyria, but Issyria is the more finicky of the two), then you should be looking at picking up Imperatus and some Griffons. Maybe an Aspis. Also, Arcanists are essential for him, and Lanyssa Ryssyl (a Minions solo who works for us) is super important.

3) General models I'd pick up for your usage that are good in almost any list are: Mage Hunter Assassin's (the absolute balls to the walls 2 point model in our or any other faction, I will fight you on this people) you should get at least a pair of them eventually, Aiyana and Holt are incredibly important for certain match ups (Cryx and Menoth come to mind), another Houseguard Thane so you can play two, all three versions of Eiryss are good (you should buy the second version, Angel of Retribution, first, and then if you like using Mage Hunter Strike Force or Mage Hunter Infilitrators pick up Eiryss, Mage Force Commander which is the third version, otherwise I'd pick up the pEiryss second). Eventually you'll want to pick up a Mage Hunter Strike Force and some Dawnguard Sentinels and Dawnguard Invictors. The Dawnguard Destors are good but not super important, they are expensive however, so I'd suggest waiting. Hyperion is tits with the All In One Box and Ravyn so I'd get him eventually. You'll probably want to pick up two of each of our heavy 'jack kits and magentize them at some point.

4) But the first thing you should do before you actually buy Vyros or any other stuff after the All In One Box stuff is play a ton of games with a friend and proxy everything. Try all sorts of stuff. ForwardKhommander has list building stuff to help you. Then pick up what you need.