Before anything, I'm sorry for not being able to reply to all comments. I recive too many. I read them all and try to reply as many as I can OTL
I still have delayed comments from February. Please, don't stop commenting. I really appreciate it

About the tablets matter, is that for a while now I've been interested in the Wacom's Cintiq drawing tablet (which is a drawing table which drawing surface is a screen, so you can see what you're doing) But the Cintiq is terribly expensive ($1000 or so, and in Europe it's price it's doubled)
Then I saw the IPads and other kind of tablet PCs, etc... which are way cheaper than a Cintiq, yet it seems they could be used the same way. Problem is, I heard they have some issues like lack of USBs, specific OS, which wouldn't allow me to use my usual programs (mainly SAI), etc... As well as that I don't know how good the graphics cards for this items are (color can change GREATLY dependng on the card'd quality, and so is very important when painting digitally)
This is way I like to hear some advice from you, if you know abou them (both Cintiq and the different types of tablets), if you've tried any and what was your experiences in painting with them and such, please.
I have an Intuos 3. I didn't know there was so much difference with Intuos 4 though.
But if I upgrade, I think I'll go for the Cintiq.
A problem I have with this, though, is that here in Spain drawing tablets are VERY rare. I had a hard time finding mine (specially the A4 size), so I'll most probably need to import wathever I buy OTL
Thank you very much
The iPad, Android 2.0 table, Asus Eee Slate EP121 [link] and Malata A1011 [link] cheaper if you compare it with the Cintiq but recalls that they are not made specifically for use in drawing that is why its quality and accuracy is a bit poor.
Anyway I hope the links and info can help you in Ur choose I would recommend you to try everything and buy the most comfortable for the kind of use you are going to give.
I'm just gathering info for now. I still have a working Intuos 3. But a Cintiq would definitely be a good help (specially for moving around, maybe...)
But it'd be very convenient since I can't use my main computer at all times of the day.