Finlaggan $50/bottle by Vintage Malt Whisky Co. @ 40%abv is much like the Dun Bheagan 8yo Islay but lacks the deapth and character of the DB's 43% bottling here and the DB is $7 less.
The last bottle of Aul Reekie was a rip-off as it was a much lesser quality than the OB and $15 more
The Signatory Islay is quite wonderful and would be absolutely stunning if they hadn't watered the crap out of it to server it up at only 40%abv. at $50/bottle it is priced about right. A better deal than the DT regional Islay at $50/bottle
The Compass Box Peat-monster dreadfully overpriced @ $70. Not likely that i will ever pay the price again it didn't have the bang for the buck of similarly styled SM's. Big E for Effort though.
JMR's Smokey Peaty One at $40 and 40%abv. a good deal, yet the whisky lacks the oomph of SM.
The Macleods is a little too rough around the edges for me thanks and i'm guessing tahts why the low price.
I can't comment on the others as they aren't available here and i have never tried them.
The best valued SM IMHO, is the Dun Bhaegan 8yo Islay.