Welcome to the Panbo Marine Technology Forums.
This came in via email from the man who put "horny" in Cape Horn -- www.panbo.com/clark-beek-way-out-there/ -- and now blogs occasionally at SailFeed. Clark Beek still owns and loves his 40-foot ketch Condesa -- though he became a pro marine electrician when he came ashore and is now managing Spaulding Marine in Sausalito -- and he's finally ready to update her navigation electronics. Let's help him out.
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First of all, Clark, our fellow industry professionals will have no trouble relieving you of that $4,000, even with trade discounts. But, man, you'll get a lot for it. And though some think I'm copping out when I say this, it's true: You can not go too far wrong whichever brand you purchase. Now some thoughts:
* I recommend a solid-state radome for its low power consumption, durability, and near range performance. One with Doppler target motion detection is even better, but probably beyond budget.
* You didn't mention AIS, and maybe Condesa is already equipped, but if not look hard at Class B SOTDMA because it may perform much better than regular Class B CS in an AIS congested area like SF Bay. Milltech Marine in your area has great deals on em-trak B350, for instance, though I should add that Vesper offers terrific extra features though not yet in a SOTDMA Class B.
That's all I have for now, but hopefully the peanut gallery will speak up.
PS. As for autopilot: I'd consider that the most optional upgrade if it still works OK. They can still serve well without any relationship to a new MFD and N2K network. But when and if you get there, you'll find any modern AP can do some integration with any brand MFD -- like sharing Heading sensor info over N2K, and steering to waypoint or wind angle -- but only a same brand AP will let you use the MFD as an AP control head. But all four major brands offer that (counting Simrad/B&G/Lowrance as one).