First of all, your English is better than that of a lot of Americans!
Does your carrier have a ROM updater on their web site for the Apache? Otherwise, it may be a problem if you flash a new ROM but need to go back to the original one. Here in the US and Canada, the carriers mostly provide official ROM updates so it's no problem for us to flash other ones as we can always flash back to the official ROM.
All of the ROMs on this site are WWE (English) only... no Spanish. I don't know if it is possible to use a spanish AKU 3.5 from xda-developers.com (if one exists) and incorporate it into an Apache ROM to convert it from WWE to Spanish. Maybe someone else knows (especially over at xda-developers).
AKU 2.2 is somewhat recent, and already incorporates some speed improvements over AKU 2.0. But AKU 3.2 and 3.5 are even faster. They also have solved some problems like the minisd card causing the device to hang (DSOD) and have added some new features. You can read some more about AKUs in this article:
http://www.mobile-review.com/pda/art...m-aku-en.shtml
By the way, AKU stands for Adaptation Kit Update (don't ask me why they chose that name). It is just Microsoft's way of issueing updates to the Windows Mobile OS. Starting with WM6 (Crossbow) they have built in a "Windows Update" type function, so maybe in the future they will use that to provide some updates to users directly (let's hope so).
Good luck.