Found a straight, clean, older 17.5' Glasply with a strong 140 Merc I/O (530 hours) and a trailer that falls within my immediate price range ($1600)...but really, what are the hidden costs of owning a boat? Please add items I haven't thought of, and if you've any boating experience in the north sound I'd love to hear comments (I know it's just a runabout, but my dream SeaSport is just a little out of my price range at $30,000 or so...)
My list looks something like this:

Throttle cable--$175 (it's sticky)
Trailer rewiring, bulbs--$30
Spare tire for trailer--$50
Insurance--$300/yr
Registration--I have no idea
Needs a kicker--what should I get? I hear good things about Honda 9.9 four-strokes--$1200
Downriggers &c.--$300
A good trolling rod--$150
Launch Fee--$5.00 a pop
With luck it'll fit in the yard of the house I'm renting--if not, Storage=$30/month?
I'd have to keep it covered somehow, but haven't priced boat covers...what's my best bet?

Pros: fishing the sound, crabbing, take the bike to Bellingham or Friday Harbor for some shopping, &c.

Cons: would probably sit in the yard from November through April, cost lots of money, and distract me from fishing for steelies in the rivers.

All comments welcome.