I use a DiveRite NiTek Plus.
http://www.diveriteexpress.com/computers/nitekplus.shtml
On sale for $349 right now, usually $495. Note the picture on the website doesn't do it justice...for some reason that picture is really grainy.
I use it as my normal wrist watch every day; it also has an alarm feature (which I don't use) and can do dual time-zones. That's nice when I have friends out of the country, or I want to make sure I don't call relatives in Hawaii at 2am their time.
It keeps track of the date very nicely as well, too--you tell it the year and the date and it knows the day of the week; just one of those neato factors.
You can use it in gauge function, meaning it's only a bottom timer/depth gauge. OR you can use it as a computer, which is what it is set up as a default. It will also do metric or imerial units; I figured that was important seeing as how you are in Spain.
Personally I think it's a great computer and would highly recommend it. Everything else you'd want to know about it is on that webpage, so glance over the features list to see what other goodies it has. I don't know if it is a big deal to you or not, but it is NOT air integrated. Personally I see air integrated computers as useless gadgets so to me that wasn't an influence on my purchase at all. If you have any questions about it, feel free to PM me.