Yes I would agree on the marples bit, if you want some good quality, general use chisels, that will last a while, stand up to a few - and work well on site aswell as in the workshop - they should be prefect!
If you plan to do alot of *fine joinery* then you might want to look at a set of cabinet makers, or even japanese chisels, which can be very accurate, and be sharpened to a high degree, holding the sharp edge.
I've got some Robert Sorby bevel edge chisels, they are very nice and I hope will last a long time.
Gill's right about sharpening. You can buy the most expensive chisels on the market but you still need a good method of getting (and keeping) them sharp. My <gloat>Tormek machine</gloat> can even make my cheapie record chisels perform excellent
There was a good review of chisels in the Sept(?) edition of Furniture and Cabinet making magazine with the Kirschen (Two Cheries) chisels coming out on top. They are available from Axminster for around £56 for the set of six - with grduated wooden handles and polished backs to the blades I reckon thats good value!.
They followed this up in the next edition with a further article on what constitutes good blades etc - very useful stuff!.
(Im not connected with Kirschen or Axminster BTW).