Answer to that is
Why not both! 
Jokes aside Guatemalan blue is very vast in shades and usually the more translucent, vibrant blue, and less cotton/snow inclusions, the higher the price (not taking into account the cut of the bangle too). So far from what he has in his etsy store, the average range falls between mid-high hundreds to low-mid thousands for a Guatemalan blue bangle. Also some jadies here have said that wait time depends on how full his hands are as he's very active in the jade community, and as such, has a large name for himself.
Alternatives for getting a Guatemalan Blue jade bangle (whether it be custom-made or pre-made within reasonable price range) is Yaxtun, MayanMountain/MayanMountainSupply, YolandaJewelryShop, and jal_9021 aka Paul Chapman.
The ones I listed here you may need to inquire if they have any blue jades to your liking that aren't processed or within your price range + desired cut.
As for lavender bangle, this I won't be able to help as much as I'm very picky with my ideal lavender jade pieces especially when those are the one of/if not the most, photogenic colors under certain lightings!
Best of luck.