I would think that if a low noise floor is a key desire than a Bryston preamp would suit the bill. If you can live with a little tube "noise" (assuming that your VTL has a wee bit of it) then other tubed preamps could be as quiet as what you have now. But I have had a BP-26 in my system on loan and its dead quiet compared to the tube preamps I have had.
Now I understand the design of the BP-26 is virtually the same as the BP-25. The largest difference is the new power supply that comes with the BP-26. Now the nice thing is this new power supply can be bought separately so if you were to score a really cheap BP-25 you could get the new PS and be ready to rock. If it were me I'd probably wait on a used BP-26 (make sure the seller has the bill of sale for the new warranty regulations). My 2nd choice would be to get a used BP-25 to see if I liked it. If not then I'd re-sell it for probably for very close to what I paid for it. If I did like it then I'd either wait on a reasonably priced BP-26 and sell the BP-25 or keep the BP-25 & pony up for the new PS.
Now I understand the design of the BP-26 is virtually the same as the BP-25. The largest difference is the new power supply that comes with the BP-26. Now the nice thing is this new power supply can be bought separately so if you were to score a really cheap BP-25 you could get the new PS and be ready to rock. If it were me I'd probably wait on a used BP-26 (make sure the seller has the bill of sale for the new warranty regulations). My 2nd choice would be to get a used BP-25 to see if I liked it. If not then I'd re-sell it for probably for very close to what I paid for it. If I did like it then I'd either wait on a reasonably priced BP-26 and sell the BP-25 or keep the BP-25 & pony up for the new PS.