The only Dell I ever had was really heavy (at Virgin's check-in desk at Gatwick the basic bag of laptop bits was heavier than their economy carry-on allowance of 6Kg :shock: !!!) and I quickly dumped it in favour of a Thinkpad (IBM). Even that is heavy once you add the power supply, plug-in CD, carry bag and a few bits of paper, mobile phone charger.... I've avoided a PDA so far.
My experiences with IBM have all been excellent -- they go on and on and on until the software eventually kills the system performance. My old iSeries 1480 is still a trusty backup and would do everything you need. If you shop around they're no more expensive than others -- and certainly less than £1300 (sorry!).
For most people who want to do a bit of word processing, quote generation and store a few pictures (and maybe browse UKW fora using broadband) an old 300MHz Pentium 2 will actually run quite fast enough so that you'd hardly notice the difference from a new machine running at 3 GHz. The Internet down't run at 3 GHz, so you're instantly limited by the speed of your connection. Even LAN's at work are usually 100MHz maximum. The only reason most people really need anything faster is to download music and play online games or DVD's....... unless you're a designer who uses complex CAD and graphics packages. Even then most systems have problems because the storage and memory transfer rates become the limiting factor, regardless of whether it's a Pentium 1 or a Mega-Giga-Pentium X-Squared. The rest is all marketing to an uninformed consumer public. Finally, beware of 'media' systems. They're nothing more than a standard system with a bigger hard drive and a £20 bit of software -- only they cost 50% to 100% more !