I know this is an old thread but,

I use the Cyclops Al rollers with the mag resistance unit. Turn that up high and you get pretty much all the resistance you want, I do intervals on the rollers.

For days that I feel like being lazy or just zoning out, or if I really want to push harder for intervals I have one of the Kreitler fork mounts, put the fork in that it's like being a trainer, except that the rear end of the bike doesn't feel dead.

All the resistance you want, rollers and trainer in one.

Works like a charm.