My friend is in Australia so I'll have to give the prices in AUS$ (also, some of the components are different)
Studio 15: £1,269 (£721)
Studio 17: $1,275/£725 (Intel HD Graphics) or $1,417/£805 (HD5650 [only option available in UK].
I think the more expensive Studio 17 is overkill for someone who doesn't game (well, only FFXI, and I reckon most netbooks could handle that, and isn't likely to watch Blu-Rays. Thoughts?