New to this strobist business and am trying to get some help tracking down a flash that will work on my 400D but not cost a pretty penny.

I will soon have a set of Cactus V2, and I would like a flash to use with them for off-camera shooting, but also the ability for ETTL on camera.

Does such a flash exist that is manually adjustable etc? I have heard people using Nikon flashes such as SB26 etc. Is this a viable option?

cheers