I've got to say Tengus are the best, I run 3 chars. I do 0.0 ratting (havens/sanctums and plexs).
I've tried using Ravens before but 10/10 plex's can really ruin your day with those energy neut/webifier towers mixed w/ scramming frigs.
The speed of the tengus mixed with the damage HAMs have over Cruises versus smaller targets is great. Plus the 100km+ distance of same acceleration gates just ruins your isk/minute with a raven.

I haven't been using any dual-boxing software for this (just a lot of alt-tabbing). About to try iskboxer.. before I shell out the dough for that, does anyone have any other suggestions for good software? (Preferably something that clones mouse clicks as well!)