I bought a Mac mini 2011 on clearance at Currys for just £299 about 2 months ago and it's the first Mac I've ever owned. Biought it on impulse really just to see what all the fuss was about. it came with a full 12 months warranty.
I've always been a Win/Intel person and for the first few days I found the Mac very frustrating. I then bought a couple of books from Amazon about the Mac OS 10.8.2 and I'm now a lot happier as I understand how it works more.
I had a spare 24" monitor, keyboard and mouse so was good to go. Then at Xmas my wife bought me the wired Apple keyboard and my daughter the bluetooth trackpad. Whilst the keyboard is awesome I'm struggling a bit with the trackpad but I'm sure I'll get there. I also upgraded the memory to 8gb as it was way too slow with only 2gb. I also bought Office for the Mac for £9.00 through a home user programme at work.
If I wasn't a gamer I'd definately only use the Mac as everything just works without needing drivers, it's so quiet and relatively easy to use. The only minor let down is the crappy Intel HD3000 graphics which just about copes with HD video but I knew this when I bought it and I'm not interested in gaming on this machine. I leave that to my PC which has an i5 2600k over clocked at 4.4 ghtz and AMD 7950 overcloed at 1025/1375.
Overall I'm very happy with my Mac mini purchase and would recommend it to everyone.