You need to use wire that meets building code for in-wall use. I have used Carol E1062.12 wire, and I think it is good, Parts Express.com. Item 100-742. It is AWG12. 500 feet costs $213, but 1000ft is on sale for $299.
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A couple other choices you might want to consider are Kimber KWIK-12 or KWIK-16, and Canare 4s11. I have used both for in wall with very good results. You might want to spring a bit more for your basement, kitchen, etc and go cheaper for the bathrooms etc. Check with your building inspectors, some are more stringent than others.