I try to focus on quality over quantity.
It's tempting to run out and buy a pair of RNP's or VTB-1's and a pair of RNC's, but that puts you out what, about 750 clams? That's not to say that those aren't quality items, but I'd rather hold off, save my money and put it towards something like a racked pair of API 312's.
I don't have a lot of outboard gear, but what I do have is pretty nice.
If you buy a rack full of less expensive outboard gear, you'll probably be happy with it, and it will probably work well for you but to my way of thinking, you're going to be left wondering how your chain would sound if you had waited and bought that Great River or Avalon or classic Neve.