What sort of money are you looking to spend? I picked up a Canon G11 for about $500 last year and it's a very competent piece of kit, although it has features a lot of people will never use.
The image quality is very good - Luminous Landscape did a comparison of the images taken by the G10 (the predecessor, which also hit the market around $500) and a digital medium format setup costing about $50,000. Under optimum conditions and printing up to about 11x19 inches the two produced results that professional printers and photographers struggled to tell apart.