Since you've mentioned Campbelltown Loch, you're obviously happy to have a blend or two at the table, so why not add a vatted malt also?
Try the Six Isles vatted malt, or a Poit Dubh, as these are very interesting & flavoursome whiskies that I daresay many people won't have tried.
Richard's Caol Ila was a good suggestion, and I'd also suggest a Clynelish.
The recent Clynelish bottlings from Gordon & MacPhail (Connoisseur's Choice) are quite inexpensive, yet amazingly full-flavoured and tasty malts. They also offer a flavour profile quite different from your standard Speyside or Highland malts.