Picking a bicycle is a very personal decision that depends on what you are
using the bike for, how much you are willing to spend, whether you have to
carry the bike upstairs, how much you weigh and a variety of other factors.
My main advice on buying a bike is to go to a good bicycle store -- one that
specializes only in bicycles and talk over you needs with someone there who
really knows bikes and respects cyclists. Do not buy a "department store" bike
from Sears, Wal-Mart, etc. You will probably be disappointed. Check with a
bicycle club in your area for reccommendations.
A few reputable brands include Trek, Cannondale, Giant, Janis and Raleigh. I'd
look to spend at least $300 and more likely in the neighborhood of $500 to $700
for a decent bike. Later on, if you really get into it, you can trade up.
I started with my son's Specialized Hardrock that he abandoned when he got a
car. It cost about $350 new, as I recall. I now ride a Trek 520 touring bike --
mostly for urban commuting -- that I bought for about $1,000. I love it. It
carries my hefty weight, accepts a lot of attachments such as racks and
fenders, is light enough for me to haul up a flight of stairs, has a steel
frame and sturdy rims.
Be sure the bike is properly sized and fitted by someone who knows what they
are doing.
As for accessories, again it depends on what you are using the bike for. I'm
partial to a good mirror, a rack, fenders, a bell, a seat bag, a frame pump, a
water bottle and a computer (speedometer/odometer). Oh, yes, and a helmet.
When I engage in "intermodal transportation" I carry my bike on a Saris bike
rack. I'm not partial to grease inside my car.
Good luck -- and happy trails.
David