The 16750 reference was the last of the plexiglass, and around '84 went from matte to glossy dial. The matte dials are highly collectible and expensive ($9K+), as it had a very short production period. Additionally, it offers a quick-set date feature which many find extremely useful. The glossy dial 16750 are priced around $6-8K depending on condition.
The 16710 is a modern reference and comes with a higher beat movement and sapphire glass. It's a thicker and heavier watch. You are correct in your assessment that in general, 16710's are cheaper as nice examples can be sourced for around $7.5K with B&P. With 16710's, the newer models (think F & Z serials) are currently commanding higher prices than tritium
I recommend visiting
http://www.gmtmasterhistory.com for a high level overview of each reference.
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