Carrie Anne, have you ever used any kind of friction shifters? Are you most concerned about the lever position or the indexing/friction difference? I've never used STIs so can't help you regarding that transition. I use downtube friction shifters, once moved to barcons and then back to downtube shifters. I found downtube shifters to operate quicker, be more trouble-free, and provide a more natural hand position than barcons. Veronica is a barcon user and will have lots of good things to say about them. Someone here (SK?) just switched a bike from barcons to Ergo levers.
Oil is good, grease is better.
2007 Peter Mooney w/S&S couplers/Terry Butterfly
1993 Bridgestone MB-3/Avocet O2 Air 40W
1980 Columbus Frame with 1970 Campy parts
1954 Raleigh 3-speed/Brooks B72