Lots of people like to use chalk inks with their clear stamps (so Versamagic or the Chalk inks by Colorbox for example) and find they get good results. Personally, I find Versafine is the best all-round ink and gives fantastic results with any kind of stamp. Its only real limitation is that it's not good if you're going to use alcohol markers (such as Copics) for colouring but if that's not an issue then I'd recommend them wholeheartedly. It's possible to buy small cube ones as well as full size pads - all my colours are the cubes, I only have full size for the Onyx Black and Vintage Sepia. Tsukineko claim that they last four times longer than regular ink and from experience I have to say that they do last and last.
You can see the range of Versafine colours on the Tsukineko web site here
Hope that helps!