I think the
Tech 21 Boost R.V.B is a better option than the Boss and the EHX (which I've got and, like you, don't really like) mostly because the Tech 21 boosts the signal so you don't get the same level of volume drop that you get with the other two.
Another option is the
Malekko Spring Chicken which is about the same price as the Tech21, at around $150.
Far more expensive (they're going for between £250-300 in the UK) but meant to be the dogs bollocks is the
T Rex Room-Mate. It's a digital/analogue hybrid which includes a valve in its circuit. Silly money but I linked it just so you could compare.