http://www.bottlehead.com has been a great experience for me. Great fun to build and incredible sounding resuls. I strongly recommend checking them out. The kits are complete unlike others where you have to buy the parts.
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I have built the Bottlehead Foreplay 2 and Foreplay 3 extended as well as the Seduction C4s preamp.
My next build is the Transcendent Sound Grounded Grid which is also a complete kit in a more conventional form factor. Info can be found on the Transcendent Sound website.
Tubes4hifi also makes some excellent preamp kits, both with, and without phono stage.
Audio Note Kits, now known as ANK Kits has some more upscale offerings.
If part kits are an option, or you want sand, the Pass B1 is very nice.
And the Aikido part kits are just fantastic.
Good luck and good listening.
If you want a really nice preamp you should consider the #26 DHT. It's the best sounding preamp tube I've ever heard, still widely available, and not overly expensive. I built a preamp using it and the sound is fantastic - check out the "#26 Preamp" thread over the DIYAudio for everything you ever wanted to know abou this tube and lots of examples of different builds.
Here's a picture of my 26 preamp build, using Cunningham balloon 26s and gas VR tubes: