The room is a very modest home office, 3.5x4.5m, with lots of PCs and two people in it most of the time.
I went for a split unit for obvious reasons and I wanted about 2.5-3kW. After talking to a supplier, they managed to convince me that I ought to go for a cheaper generic Chinese unit rather than the Fujitsu which I initially wanted.
Given that the Fujitsu was about £950, and the unit they recommended was only £550 all in, and that it would only be used for say 2 months of the year, I decided to go for the cheaper one. I may end up regretting that, I may not - I don't know.
The unit included all the hoses, multicore cable and brackets for a complete self install. The install was a piece of cake - the hardest part was the 3" hole through the 2' wall.
Once you've installed it, you bleed off a small amount of refrigerant through the system, which flushes out the air. That's it - no vac pump needed.
It's now running fine (there was a minor problem with the main indoor unit fan rubbing on the case, but a small modification fixed that).
I will post if it breaks or anything bad happens.