MB Gungnirs with the A2 board and gen 5 usb shouldn't cost that much, but how much better than your bifrost (a 2 or a 2/64)? 2/64, maybe not much.
A Gungnir with an A1 and unison would cost more, but, the chassis and boards in it are at least 5.5 -> 10 yrs old. I have one, it's going nowhere, but a friend thats got the bug (660, Clear OG, Ananda; Liquid Platnum in the last 60 days), I'm trying to talk him into a new bifrost 2/64, but not a used (only way now) Gumby, and certainly not a DS, or the cost of a DS -> MB and update to unison.