Dura Ace STIs - 7800 or 7801

Can anyone help me decide which of these I should be buying?
I can't find a proper description of the differences anywhere, but it seems like the 7801 has a skinnier body and a shorter lever throw. Does that mean it's suitable for smaller hands, and therefore being a normal sized hands person, I should go for the 7800?
The later serial number of the 7801 implies it is the more up to date version, but the 7800 still seems to be in full use as a current version, and some retailers charge more for 7800 than 7801. I'm confused.
Can anyone help?
I'm NOT interested in 7900 and it's backward compatability traps!
I can't find a proper description of the differences anywhere, but it seems like the 7801 has a skinnier body and a shorter lever throw. Does that mean it's suitable for smaller hands, and therefore being a normal sized hands person, I should go for the 7800?
The later serial number of the 7801 implies it is the more up to date version, but the 7800 still seems to be in full use as a current version, and some retailers charge more for 7800 than 7801. I'm confused.
Can anyone help?
I'm NOT interested in 7900 and it's backward compatability traps!
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The STI brake shifters start with ST-780x, but there is an SL-7800 which is the old style downtube or barend shifter, which would be much cheaper but not what you want.
So a retailer advertising 7800 and 7801 STIs at different prices is making a balls up and I should just go for the cheaper one because they're the same?
If you check the Shimano website it doesn't list a 7800 STI.
http://cycle.shimano-eu.com/publish/content/global_cycle/en/au/index/products/road/dura-ace.html