Tacktick also has a problem with upgrades. The units are fully sealed so can't take a software upgrade. As an example of a problem, when they came out with their masthead wind instrument, it was incompatible with the other head units. You had to buy a complete new Tacktick system to get them to all interoperate. For this reason, Tacktick gives a "trade-in credit" when going to newer models.
I've got Navman's on my Precision 23, and haven't had any problems with them. Apparently, other people have had some quality issues with them, but I actually like them (although they are impossible to read with polarized sunglasses). My new boat, a Passport 40, has
Raymarine ST60's on it. If you don't mind cutting huge holes in your boat to mount your instruments, they are some of the higher quality instruments. Also, as Giulietta said, B&G has great instruments, but others are catching up. B&G has some amazing predictive systems that are in use on cup boats and the Open 60's.
For a new system, I would definitely look at NMEA2000 capable systems. Then you can interface several different manufacturers for speed/depth/wind/chart/radar/repeater etc.
Chris
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s/v "Pelican" Passport 40 #076- Sort of For Sale - Willsboro Bay, Lake Champlain -
http://www.passport40.org
"Don't dream your life, live your dream" - Bob Bitchin'
"I'll see it when I believe it" - Me