If cost is not a question, a decent megapixel IP system with adequate lighting will serve you better than the equivelent analogue system provided its configured correctly. Name brand IP cameras such as Axis, Arecont, Panasonic and Mobotix are what you should be looking at. Bear in mind that there are licencing requirements for some configurations. And, although you can run free software, you may be better off looking towards a hardware NVR such that it's then a completely separate system. Video surveillance is very resource hungry on any PC/Server and the processes often don't play to well with others running on the system.
Think about the cost though as there is a reasonable, although diminishing, difference between analogue and IP when you're talking decent CCTV.
One last thing, avoid eBay systems. If you have to ask why, then you should be employing the services of a professional to install your system.
Oh, and if you do go IP, don't forget a PoE switch.
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