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#21
You notice the SSD mostly in boot speed and anything that is disk intensive, such as virus scans or opening big applications. You don't notice it for stuff like looking at this forum. Gamers say it doesn't make much difference for games either--they load faster, but that's about it.
If you are going to build now and upgrade continually over time, you should concentrate on the foundation parts--stuff that you likely won't upgrade for several years---case, motherboard, processor, and RAM.
There's a big difference between a 400 pound budget for the next 3 years and a 400 pound budget today and say another 150 pounds in 3 months. If I knew I could add in another 150 pounds in 3 months, I'd probably build the thing without a video card and just use integrated video for the first 3 months.
If you did that, you'd have a mediocre gaming system for 3 months, but you could buy better foundation parts today. After 3 months, buy a video card.
The 150 pounds you don't spend today on a video card could be spent on an SSD, HD, better case, and stronger processor.