+1 Redbreast - it's a brilliant tot - it's a "single pot still" whiskey - which is the one uniquely Irish style of whiskey making (as some Scottish distilleries do triple distil), whereby both unmalted and malted barley are used in the mash bill. It's one of the few whiskies I always buy if I ever see it on special offer (I think it might now be down to £35 at Booths) - but it's not a "difficult" dram - my Mum and Dad loved it, and they tend to prefer the "easy drinking" end of the scotch market.
For well-rounded Scotches, my current favourites are Springbank 10, Clynelish, and the Benromach 10 (or the "Organic"). Although, they might all be a little out of your range (£40-45, unless on special offer).
A total flavour-bomb / acquired taste would be something by Amrut - an Indian distillery. Amrut - Fusion and the Cask Strength are incredibly potent. Super-charged ageing in tropical heat means Amruts develop a lot faster than Scottish malts and can develop a lot of taste quickly - which encourages experimentation with casks and malt bills. When they are good, they are wonderfully intense... when they are bad, they can be a bit hot and immature (but no worse than, say, Aberlour Abunnah).