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If it's the same or better to your current laptop and you've no complaints then no biggie. You can just fit more on the screen. I prefer to have more information rather than big fonts and buttons.
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They'll all do the job. The most expensive HP has the best cpu. I'd prefer a higher screen resolution than all of them personally :P

How much will it cost to relieve yourself Peter from pc world's grasp? We can do a charity ball if you like... Anybody know a DJ who will work for a plate of cheap buffet food?

Traktor has quite a high system requirement compared to virtual DJ and serato.

2.0ghz i5 processor minimum. (serato 1ghz i3+, vdj pentium 4) altough a 2.4ghz core 2 duo managed okay... Which is...

Oh also don't get a low clock speed on the cpu! DJ software doesn't seem to be able to utilise multiple cores well... Or at least a couple of years ago it didn't! Check single threaded performance...

My fiancée hates it when I say this but... "that's how they get ya!"... I've had 4 laptops from pc world... Only one I've been happy with and I didn't just get cheap stuff.

No wonder people...

The i3, i5, i7 models are essentially just a name to suggest performance. If I'm not mistaken i3 processors are dual core processors where i5 and i7 are quad core.
some i3 CPUs are better than i7...