I would probably say my speakers. I bought them in 2000 and they still are best audio equipment I have ever bought. They are Infinity Overture 1's and I bought them when a shop in Amsterdam had them on sale. Brand new they were incredibly expensive. I also bought the matching stands when they were still on the market. They had a bad reputation for switching of at low volume levels, but I have never experienced any problems. I suppose I bought the pair when the problem with the electronic switch had been solved.
When I auditioned them in the shop, I couldn't believe how much better they sounded than any other speakers. They are a design you never see anymore. Each speaker has got a powered 150W subwoofer.
One thing I have noticed is the fact that because of the powered subwoofers, they are really easy on amps. They sounded great with our previous Denon DRA-1000. Now they sound great with our new Yamaha R-S500.
I don't think they were ever on sale in the UK. They are an American design and there are hundreds of American reviews that also rave about them.
Here's a picture of them.