"effi" writes:

fiberglass = no need to top it off in 5-10 years
well... with less R in the walls.

I also think cellulose has a higher r value.
it can [...] unless more fiberglass is used ; )
don't have it in front of me, but i thought the OP was retrofiting
wall cavities. kinda hard to put a 2 inch thick layer in a 3.5 inch
thick cavity....

I've been pondering the best route to go insulation wise for a while
now. I'd really like to go foam... best R per inch and seals air
leaks. Cellulose is a close second. (next best R and some air
infiltration protection)

I can't seem to find anyone who'll do the foam locally.
there is a DIY site with a low expanding DIY foam... www.fomofoam.com
IIRC. Kinda expensive, but then so is our winter gas bill.

--
be safe.
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