For starters, I'd look at the Thill Center Sliders. They're designed for ice fishing and other forms of vertical jigging. Bass Pro (among others) carries them:
http://www.basspro.com/webapp/wcs/st...=SearchResults
Another option is a large pole float like the last four floats on this page:
http://stores.jedrex-carpfishing.com...rt=49&total=91
I'd get floats in the 1-2.5 gram range. You will also need silicone sleeves to go with the floats.
Wacker also carries similar floats: www.wackerbaits.com