Hola, elHector!
The R20 really isn't a scanner; it's a receiver that scans, albeit rather slowly in comparison to the scanners currently on the market.
Another question needs to be asked here; are you going to travel with whatever you buy to the mainland? If you do, then the PRO-106 would be a good choice, since it supports a digital format currently used by many public service organizations. However, if not, there isn't any reason to get a digital scanner - a quick check of the listings we have in the database for PR show no digital systems active. A scanner such as the PSR-300 or PRO-164 would work just fine.
The HF world (3-30 mhz) is a totally different animal; radios like the R20 are usually a compromise in how they perform in this band, due to many considerations (most of which have to do with keeping the manufacturing costs down). If you are interested in this, consider examining this article from our wiki (all links are in blue, by the way) which lists LOTS of links to various levels of reviews;
Category:Receiver Reviews - The RadioReference Wiki
73 (best regards - an old morse code shorthand...) Mike
