I really liked Opalka in 2011, but production was modest.
San Marzano is a workhorse with good, but not great production over 3 months. Shapes are "well behaved", longer than standard Romas with somewhat pointed tips.
Viva Italia (a hybrid) is very similar to Roma but is (for me) slightly more productive and less prone to blossom end rot.
San Marzano Redorta fruits looked very promising, but they seemed to take forever to ripen and production was low.
I'll put in a plug for Heidi - about the size of a standard Roma, perhaps a bit smaller. Deep red color, fairly consistent shape. Flavor is much better than Roma. Indeterminate and very good production - rivaling San Marzano - over several months.
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