If you can’t get a 1.6A, just bump up to a 2A. I use 2A in Class A based preamps because it give it a lot more authority when the music "hits". That’s the most I would bump up, though.
It’s interesting that he describes SR20 as smooth and warm. I definitely wouldn’t call it "warm", but I can agree that it’s smooth. In fact it’s so smooth and clean that I don’t feel you’re getting enough texture/grittiness/bite. lol. This may be exactly what you’re looking for, though.
I don't know that VH Audio will come down on their price (they still have the old Hi-Fi Tuning Gold at full retail!). I think that Parts Connexion decided to discontinue sale of the SR20 and are just blowing them out of inventory.