In reply to laurap120: There aren't really any 'poor' brands on the market but climbers will argue for hours about the relative merits of the main premium brands.
There are 3 mainstream premium brands in the UK:
Black Diamond - top notch gear designed in the USA
Wild Country - the original manufacurer of 'cams' with a solid proven UK design that lasts for years.
DMM - Superb kit designed AND manufactured in Wales.
Metolius is another top US brand who make superbly finished kit. But with more limited distribution in the UK there is less availability and discounts off RRP are rarer.
It is further complicated in that all the big manufacturer make basically two ranges: 'normal' cams and 'micro' cams. In generally micro cams are aimed at expert climbers attempting the hardest routes and are not relevent for beginners:
Black Diamond- C4 Camelots (normal) & C3s (micro)
Wild Country - Technical Friends (normal) & Zero Cams (micro)
DMM - 4CUs (normal) & 3CUs (micro)
There is one other niche manufacturer CCH (Colarado Custom Hardware) who produce Aliens which were the orginal 'micro cam' design and have a loyal following but very limted distribution.
Take your fiancee to a climbing shop and see what make/type he looks at and plays with most...