Hey Hey Hey!
It's great to see recommendations for 15yr old Glenfiddich, it would be a great step in a different direction to complement your Laphroaig. Right now you should be able to get a 1ltr of it at your price range which makes it one of the best value for money single malts on the market (it's also the fastest growing Single Malt in the US). What makes it different is unique production using their Solera system.
3 different casks are used in the making (1st fill European sherry casks, used American oak hoggs heads, and used American casks which are then finished in 1st fill American hoggs heads for 4-6 mnths) These are all then put in to a Solera vat (unique to Glenfiddich) which holds around 35,000 ltrs of whisky. When they come to bottle the product they only remove half of the vat, so the next time it's filled there is some of the first batch remaining for consistency.
This makes it a really sweet sherried and honeyed whisky with lots of fruitcake. Importantly it doesn't have the bitter finish that you associate with some Scotches which are finished in 1st fill Sherry butts, or spend the entirety of their life in Sherry. That's the secret of Solera!
I would stay away from Jura, they have real issues with decent cask stocks right now, and I've heard some reports that although they're doing the best they can with what they've got it's still coming up short of decent.
The Balvenie is certainly a good choice also, known as the most hand crafted single malt in Scotland. Balvenie Doublewood is really rich tasting beyond its years and sits in your price range. You can still find a few bottles around of 10yr old Balvenie which is soon to become a bit of a collectors item since the distillery no longer produce it, some of the bigger stores may still sell a bottle or two. Look out for The Balvenie Signature, it should be hitting shops pretty soon, it's the signature balvenie style from their master blender David Stewart who been making Single Malt for over 46 yrs now.
Maybe check out Dr.Whisky on line, he's sure to know
If you want to keep yourself in peat territory then one of my favorite Islay malts right now is Bruichladdich, independantly run and just like Glenfiddich these days they are doing some really interesting things with Single Malt.
By the way, I tried the Singleton recently it doesn't taste bad at all but I just can't taste much at all. It's one of those Scotches that promises much on the nose and doesn't quite deliver on the palate. Can get better for your money in my opinion.