Whisker biscuit would be a great decision and Extreme RT 900's for a sight. You can find a good price on the WB on AT's classifieds, probably around 35.00 to 40.00 for the Deluxe edition. I'd buy a new RT 900 and they run around 60.00.
As for the WB not shooting properly when wet, I beg to differ on that. I've never had a problem with mine shooting off the mark when wet.
The fletchings, blazers are the best vanes out there in my opinion and do not get worn by the biscuit.