No, its all right. I mis-read your post. I can see that would make sense, although concerned it would cramp me up on the flat. I'm tall, but much of my height is in my back, not my legs (my MTB (Spesh Rockhopper) I bought 'off-the-shelf', but my road bike has been set up properly for me, and I have a medium-large frame (Giant Defy), and but a really long stem).
The Gravity dropper seat post sounds interesting, might look into that as it could really help. How expensive?
Several on the market right now. (I'm gonna put one on my new build)
Crank Bros Joplin, which work well and you can find at £110 with straight lever or £130 with a handlebar remote. Review well in current guise.
Pure Racing KS i950 Again, reviews well and is out there for around the £180 mark , with added remote options.
Giant Contact. Only available in 30.9 apparently, but cheap at £150- 170 all in.
Gravity droppers range from simple £170 to remote etc at £240 plus.
Rockshox Reverb. Industry standard and absolute favourite, £200 plus incl remote, but folk swear by them
Crank Bros have just announced a new type, the "kronolog" with an air spring instead of hydraulics, and this may well be lighter. No idea how much they'll be or when they'll be available, but it looks good in the release photos.