In reply to BnB: The 'value for money option' is probably to buy some Wild Country Technical Friends second-hand in good condition. The Tech Friend design with its plastic re-enforced stem is massively robust and durable. I'd go for sizes 1.5, 2.5 & 3.5 which might cost you £60-£70.
If you have more money available or want to buy new, the obvious choices would be Black Diamond C4 Camalots or DMM Dragons but their doubled sling is less useful in Winter being fiddly to handle wearing gloves. In Camalots you could probably get away with only sizes 1 & 3 as they overlap slightly. Other options would be sizes 0.5,1,3 or 1,2,3 depending whether you want coverage for smaller cracks or additional coverage for medium/large ones. The equivalent sizes in DMM Dragon cams would be 3&5 or 1,3,5 or 3,4,5 respectively.
Finally, the 'lightweight' option, should weight be a primary consideration would be Metolius UL (Ultralight) Powercams as they are currently the lightest on the market.