Oh, that's a great question! First you have to tell me if you're asking about cross-country skis or downhill skis, but I'll just write short on both.
Downhill: I recommend Atomic. There are very many different brands, but I'd recommend Atomic. Though, on amateur basis it doesn't matter so much. There aren't really so big differences, so nordica and fischer also work well.
Cross-country: There are basically two great companies offering cross-country skis, Madshus and Fischer. Of course there are more than 2 companies, but these are the biggest and most famous ones. My personal opinion is that Fischer is better for skating skis, and Madshus is better for classic skis, but on an amateur basis that doesn't matter so much. Both of these work well, but you shouldn't pick any other than Madshus and Fischer.
I hope this was helpful, and I really hope you didn't mean the models, cuse that would take ages to write :)
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