There is an interesting site for any question about "a good, stable tripod, that is not heavy but cheap". Forgive me, it's in german language:
http://www.stativfreak.de/
There you can see practically all tripods available. These guys try and compare all tripods, and they know a lot about this matter.
The all-time favourite is this one, made of canadian ash tree:
http://www.stativfreak.de/GALERIES/3BEIN/BERLEBACH/REPORT3032/3_berlebach_3032_01_jl.htm
Short translation (sorry for my style, I am not a native english speaker):
"It looks heavier and bulkier than it is. It is the most stable tripod we ever used. It has less vibration and is even sturdier than our favourite Gitzo G1348. It is not the lightest and shortest tripod available, but it's worth taking it along. As the levelling facility is built in an extra ballhead is not necessary. We use it in conjunction with a Novoflex quick-release unit that includes a panorama plate....
...
All things considered, at this price (around 200 Euro) there is nothing better in regards of vibration dampening and stability."
They make more than 150 different versions, all sizes, types. colours, and you often find them cheap in slightly used condition on auctions. They last a lifetime, buying a used one is quite a safe bet. I have a similar one without the built-in ball and use it with a Manfrotto gear head and, sometimes, with an ancient 2-way tilt head.