elpmas, the Intuos5 Medium is amazing. I use one with a Dell 30" LCD, not only for Photoshop and Illustrator, but for all the other programs. It works amazingly well, except for the touch input, which is not on par with a modern laptop trackpad, even though it works well with the latest drivers from Wacom. In fact, I haven't used a mouse for the past 14 years. The tablet is much more ergonomic and cured my wrist pain.
If you have a very large display, like mine, or use multiple LCDs, I'd recommend you to buy the medium sized Intuos. The higher resolution is very apparent when you map the tablet to a large display area.
If you're using a display up to 1920 x 1080 pixels, like most 24" LCDs on the market, the Bamboo Create would suit you well. It's a great tablet that can be used for professional work just fine. You can find here a
comparison between the Bamboo and Intuos models and also a display vs. tablet size chart.
Hope this helps.