The Laphroaig 15yr is good stuff. Last I heard they discontiued making it and have replaced it with an 18yr (I have 1 bottle of the 18yr and it's at 48%). I enjoyed the 15yr, and am certain you will too.
I can't help you on the Octomore. I have a bottle of the 1.1 but have yet to crack it. But please please please let us all know what you think when you tap into yours (I'll do the same, eventually lol)
As far as your list goes (IMHO):
I would grab a bottle of Ardbeg's Uigeadail. Out-eff'n-standing dram!! 54.2% As peaty and as smokey as one could ever want. And it still has complexity to keep you pondering
If it's the-most-highly-peated-scotch-ever you're after, try and find a bottle of the Supernova. I've heard 150ppm on their first release. Not sure what the second release is at. As far as I can tell, Ardbeg and Bruichladdich seem to be going back and forth.
Caol Ila is another I love. Grab their Cask Strength (55%) if you can. It's peaty, but different from the Ardbeg as it's not as smokey. More... iodine and sea, less bon fire. To me, it tastes like the Ocean. I grew up on the coast, so it tastes like home. I dig it. If you can't track down their CS, then the 12yr is the next best (readily available in my neck of the woods)
Lagavulin has left me disapointed, but lot's of others who swear by it.
Talisker is always good. But I think their 10yr should be at least a 12yr. So I'd skip it and try and find their Distiller's Edition. A great drink come winter.
Peat Monster is good. It's a Vatted Malt (aka blended malt...). I had the pleasure of sampling this (along with the entire Compass Box range) with John Glaser at a tasting. If memorey serves, Peat Monster is made up of three whiskys - Caol Ila (the main ingredient), I think Laphroaig, and the third I can't recall, but I believe it was a Highlander (which surprised me). Very good stuff (I'd recommend it as it is very fairly priced for it's good quality) but not as 'strong' as what I think it is you're after. So be careful if you purchase it you don't get disapointed. I'm still kicking myself for not grabbing a bottle and getting it signed.
Others I'd reccomend...
Smokehead. Seems to be another vatted malt. No age on it. Not even sure what's in it. It's decent. Smokey, but not complex. It fakes it, but it fakes it well. It's smokier than the Peat Monster, but not as complex. It's low price helped it.
Ledaig 10yr. Pronounced Le-ch-aig (I think, haha). Only tried it once at a festival. Left a good peaty impression. Great price. I'll grab a bottle one day.
Bruichladdich Peat. Haven't tried it yet, but thnking I'll grab a bottle this week to crack.
Laphroaig 1/4 Cask. Have heard nothing but great things, but again, I've yet to try it. I'll snag a bottle when I pick up the Bruichladdich.
Sorry for the lengthy reply. But I get excited about peaty things. Keep us posted on your progression!!