Well, I use the Bamboo Splash. It's light and handy, easy to use, comes with an awesome drawing program, and is only $70. It's a great tablet, especially for a hobbyist- a nice, basic tablet and is sturdy and portable.
Honestly, I use Bamboo create. It's good if you want a tabby that you can just jump on and use. Sketchbook Pro might be something you can look into. Opencanvas is alot like SAI but it still has its own features.^^ There's also GIMP and FireAlpaca if you want free software. MyPaint or Krita might also be some options.
idk what your budget is but... if you have more money to spend ...look into the wacom Intuos5 series. small($230) or medium($350) will be fine depending on your budget. They have a combo with the large and corel painter for($570) or just corel painter is ($250)....If thats a little out of your price range i would recommend the wacom bamboo create($175-200), it comes with a better pen then the other bamboos. I would stick with wacom tablets.
IF your in school they have a deal for students, gets a little price cut.[link]
Hmmm FireAlpaca, eh? That sounds promising! I heard a friend talk about it. And well, I do love alpacas! Ill probably check it out later. Gimp, I've already tried it. I still don't know if I like it or not lol.