Peter,
To me "offshore" means at least 25 to 50 miles from the coast, so I am not sure what you mean by "offshore" in reference to Pt. Townsend. If you really want to go offshore, I would suggest you launch out of Neah Bay or La Push--but on the other hand, as much as I love the C D 22, I don't consider it an all weather "offshore" boat in the North Pacific.
Back to gear: There are a whole new generation of electronics by both Ray Marine, Furuno and Garmin which have just been released. Many want a single large moniter--My opinion is if you go with one moniter you may want 12". I personally prefer several smaller moniters. I like two GPS, a separate fishfinder. I like at least one VHF radio, and a separate hand held submersiable waterproof hand held. If you are going offshore, you want radar, and and EPRIB.
Brands--I own no Raymarine (an old prejudice)--but they are very popular. I also own Furuno Lowarnce, Standard Horizon, & Garmin I personally prefer Furuno, but Lowrance gives a great "bang for the buck". If you are going to multiple different areas, consider a hard drive GPS chart plotter. Lowrance uses Navionics or Nautipath charts. Furuno uses Navionics or C maps. RayMarine uses Navionics charts. Garmin, only uses Garmin charts. Garmin is the easiest chart plotter to use.
"Dream package" of electronics would be the new Furuno Navnet 3, with two 12" screens, 4 KW 24 mile closed radar dome, the 1000 watt fishfinder module, weather fax module, AIS and the GPS system, with two antennas. Interface this with the Furuno autopilot. Of course this will not be on the market until the spring....but it is state of the art. Also in consideration would be the Garmin latest series, coupled with the TR1 (now rebadged Garmin) autopilot. The Raymarine "G" series--all of these are new, and look fantastic--worth waiting for!
I certainly agree with the extra batteries.
You can read all of the threads on single vs twins. Our Tom Cat has twins and the CD 25 has a single plus kicker--either twins or single and kicker works. Be sure you have a separate fuel supply for the kicker.
We keep a waterproof "ditch bag" with 6 extra flares, 6 extra day/night hand held flares, hand held vhf, hand held GPS, ARC Firefly strobe, extra 406 EPRIB, at least a dozen AA batteries (which power the electricals), multip purpose tool (Gerber or Leatherman) cigarette lighter, duct tape, electrical tape, 1/8" line, solar blanket, plastic tarp/poncho, back up first aid kit, small Vise Grip, spark plug wrench, copies of the credit card, boat's papers, driver's license, Passport.
We don't carry a life raft, but do carry an inflatable--when really "offshore" we have a CO2 bottle which will inflate the dinghy rapidly in an emergency.
Add a radar reflector, sea anchor of some form, with line and chafing gear (probably a para-anchor if you are really going offshore)--we also carry a ham SSB radio (but the average boat would not carry that).
I certainly agree with the Wallas stove and camper back.