I have a 6ft chain-link fence about 40-50' long, full sun, access to both sides. Which of these varieties would do best using it as a trellis? I'm assuming the varieties with smaller fruit (cherries & plum), but I'm not familiar with the growth habit of the plants themselves (assuming that could make a difference?).

Italian paste, opalka, black plum, blondkopfchen, black krim, black from tula, brandywine, cherokee purple, neves azorean red, & mortgage lifter.

I'm also hoping to find a Sweet 100 locally.

Black Krim, Tula, and Cherokee are smaller plants IME and should do fine on a 6' fence.

Never grown Black Plum or Italian Paste (several diferent varieties with that name) or Blondkopfchen.

You might want to check out all the info on all of them on Tatiana's Tomatobase.

Dave

V = the big French database Ventmarin.
http://ventmarin.free.fr/passion_tomates/passion_tomate.htm
CF = the Cultivar Finder at the forum we can't link to or name.

Black Plum:
V = 5'10" - 6'6"
CF = in their 4'-6' category

Italian Paste:
V = no size listed
CF = variety not listed

Blondkopfchen:
V = 4'10" - 5'2"
CF = in both their 4'-6' and 6'-8' categories, which I interpret as perhaps 5'-7'

So it looks like Blondkopfchen, Black Plum, Black Krim, Tula & Cherokee are good ones to try along the fence. I'll try an Italian Paste there too (the seeds were a freebie from TomatoFest, just listed as "Italian Paste", figured I'd try them out).