Recs.
Updated
Colemak Mod-DH is a minor modification to the Colemak alternative keyboard layout, moving the heavily-used 'D' & 'H' keys to the bottom row assignments for both index fingers. Moving the 'D' allows 'G' to return to its QWERTY placement. Moving 'H' out of the "center column" improves ease of typing 'HE', the second-most common bigram in English, now handled by adjacent fingers on the same hand in its rest position.
SpecsUpdate
Pros
Pro Much less lateral hand movement compared with regular Colemak
Some people find moving D and H to the bottom row much more comfortable (especially with flat keyboards). Curved keyboards like the Kinesis Advantage also help with lateral motion. Regular Colemak on these keyboards might be the ideal solution since then you help resolve some of the cons of regular Colemak without adding on the ones from Mod DH.