Ha. totally cool. When i started i had a hell of a time trying to get all my equipment together. I spent probably 4x what i could afford just buying stuff, trying it out, and replacing it with something better.

I would say get the 250w kit for sure. That way you'll have everything you need as far as lighting is concerned. And £79 (about $120 USD) for a 250w ain't too bad. Could find a cheaper one in the states, but international shipping grow equipment is probably not too fun.

The 250w should work well in that cab, it's about 10,000 lumens per sq ft. Which is 2x the standard i told you about above. as long as heat is under control and you can get a handle on watering and feeding and all that stuff, you should have some enormous buds. The best part about the light is that you could double your cabinet floor space and still use the same light.

Don't get too crazy. It's your first grow. there's a huge learning curve ahead of you. You may kill them all the first round, or you may be a natural. Don't spend too much, keep it basic (good light, good soil/nutes, good air flow) and you will be rockin'.

Til' next time.
Skeet.