i think the one piece is easier.
nope you wont need all those tool till you start making lams etc.
although a router is a big help when making the form.
if i had to start all over again... i would possibly get the starter kit from bingmams- form clamps, hose , thermostat , formica, pressure strip,etc etc. then get the template for the r/d bow, and materials for about 3 bows from kenny m.
that gets you started.
a hand/foot pump will work, or just a cheap small compressor will do the job, as long as it gets past 60 psi.
borrow a router to make your first form.
and buy one of these- if you are going to only have one power bow tool, this is what i would get
http://www.homedepot.com/p/RIDGID-Oscillating-Edge-Belt-Spindle-Sander-EB4424/100061671 , bandsaws etc etc etc ,are cool but they can come with time.
some files and rasps- lots of sandpaper. good to go.
get a roll of string material, and some serving thread and a serving tool from binghams, and build your own strings at the same time!