I use a variety of suppliers and kits but am more recently, due to members on here pointing them out, using Timberbits in Australia. I have never had a supplier that won't give you technical advice although after turning a few pens you won't need any an you'll probably find this forum will give you whatever advice you require.
When it comes to buying bespoke fittings the only place I know of at the moment to get such things as silver is the states but I haven't looked that hard.
With regards to reliability, there are so many. The basic slimline is a good kit and at only a few pounds is very versatile in what you can do with it. I think most people have their own favourite kits and mine is the Sedona although the Roman Harvest, Sierra and many others are just as good, if not better in some peoples opinion.
I have only done a few acrylics so unfortunately cannot help but I am sure there are good and bad ones. Some of the others on here will undoubtedly help you there.
