Glass is a good choice for a variety of reasons
glass doesnt get hot. If you'd used a metal pipe of some kind (cheap pocket pipe maybe) they get really hot if you plan to do some lengthened smoking. It's also chemically inert....meaning nothing flakes off, or is chemically started to change the flavor of your herb. Its easily cleanable too

(plus glass looks the coolest by far).
also, bubblers and bongs are nice because they filter out ash that can be irritating to inhale (i dont mind, but occasionally you'll catch a big ash and its not fun) they also cool the smoke some...to say, i cant think of a good word...but bong/bubbler smoke is SMOOTH (even though weed is already smooth to inhale...this helps a lot)
by small bubbler, a small one ive seen was about 7 inches long...only 2 or 3 bigger than your average glass spoon, and prob 10x better
a good site, is the link in my sig...they offer top quality pipes, and ive bought a bubbler there before. You'll be amazed by the quality, and each pipe is individually made so what you see in the picture, is exactly what you get. Prices may be a bit steep in some area's, the cheapest bubblers are about 145...but you get what you pay for. check it out
peace