Some specific suggestions...
Alex, it appears you've already narrowed the choices down to a) wanting to install a all-band receiver that is capable of LSB and USB reception, and b) want a bit more info on how to proceed with the Baja trip re: using the SSB.First, the receiver: you want something with the best sensitivity you can find (so shop & compare specs), with a larger, high quality speaker (since audio quality will shape you hearing what it hears), and that is robust. For many years, the best small all-band receiver available was the Sony 2010 and these can still be purchased used. It is much larger than most other models but meets all of the above criteria. (see http://www2.rnw.nl/rnw/en/features/media/productreviews/receivers/icf2001d.html) More recently, it has been replaced by the SW77 (see http://www2.rnw.nl/rnw/en/features/media/productreviews/receivers/icfsw77.html). You can shop for these on the web or from dedicated radio shops; a good radio vendor I'd recommend is Amateur Electronics (see http://www.aesham.com) altho' a local provider may be more suitable since a hands-on demo might be very helpful to you.The typical choices you find in the boat stores (e.g. Grundig's Yachtboy) are cleverly if cheaply built and, altho' they have the functions necessary, they simply don't hold up well and are devilishly difficult to repair. (I speak from experience). Some beefier and more robust choice, if larger in form factor, is a better choice...and you'll pick up Armed Forces radio and other programs that will keep you in touch with back home, something you'll appreciate after being gone for a while.All these receivers come with whip antennas but without a doubt the best single way to improve the radio's performance is to install an external antenna. You can run a simple/inexpensive piece of insulated wire (very thin vinyl covered stainless wire is a good choice and won't go away like copper) to your masthead, attaching it at the masthead with non-conductive line and bringing the line down to the boat's quarter, where it can be tensioned & passed thru a small stuffing gland below deck, to where you would run the external antenna lead from the radio. These small receivers rarely work well on boats (especially with your DC pump or fridge running) and this antenna is a way to overcome some of their limititations.Altho' this isn't what you have in mind, I'd encourage you to consider another alternative: a simple, 'real' amateur radio transceiver. The antenna installation will be a bit more complicated (tho' not very expensive) and the unit will need to be permanently mounted & powered. However, it will be no larger than the radios I mentioned above, it will be a more capable receiver, it will not cost you much more $$, and it will lead you along an upgrade path if you would like long-distance communications in the future. You do not need an amateur license to listen to any frequency on this kind of radio (something like an Icom 120) and performance will be far better. Perhaps something to think about and discuss with one of the AES folks via their 800#s.Re: nets, there are a bazillion different places where they live on the Net. Given your cruising plans, I'd suggest you start with Downwind Marine in San Diego, a store you will become intimately familiar with before crossing the border. (see http://www.downwindmarine.com/) Downwind operates it's own net, as I recall, and I believe you'll find links to net lists relevant to your intended cruising grounds.Good luck and enjoy your time down South.Jack