I gather that you're only looking for a radio receiver, not a full-fledged SSB radio that allows ship-to-ship and ship-to-shore communications.
In any event, this is one area where it DOES NOT pay to go for the least expensive unit. While the Grundig 400PE unit is inexpensive, it's a discontinued model and the $89.95 units are not new but "reconditioned." The price may attractive, but I'd have reservations basing my and my family's lives on reconditioned equipment when going offshore.
Obviously neither the Grundig or the Sony pull in the weather fax signals. But if you are considering the Sony ICF-2010 and you don't need the weather fax feature, then you should definitely check out the rave reviews this radio gets at eHam.net (the online ham radio geek site):
SONY ICF-2010 Product Reviews
However, if you want to get up-to-date weather info in graphical display format, the Si-tex is the way to go plus it connects into your 12VDC house battery system (no need for a pile of "AA" batteries which get quite expensive in the Islands) - but the Si-tex doesn't have the FM / AM bands for the entertainment side.
Your communications and information systems should be the absolute best you can reasonably afford, since they are your only conduit for accessing essential information (as well as providing entertainment).
good luck in your sailing adventure!