Try www.aksa.com for solid state kits or do a web search for nelson pass amp designs. I have never done myself but hear about them often in a positive light. Good luck.
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Bottlehead has very nice kits available, with excellent sound. In my system, the Bottlehead amp sounded much better and was even quieter than a $1000 tube amp. The amp posted in my systems pages was my first DIY project as well.
Take a look at:
If you are more into Solid State, I would recommend Nelson Pass' websites: