i don't know which ones they sell but the two i have experience with are...
for best bang for the buck and best first boom pole i would say the gitzo carbon ones.
they are not internally threaded but they are very light and very strong and under $200
then for a really long one with lots of options and internally cabled the k-tek
i recently got the ktek that is 3 ft when collapsed and it extends to over 12 ft.
it has the internal cabling with a right angle at the end so you can set down the pole a not ding the cable.
i also have two of the counterbalance weights and when using it in the 9-11ft range with a heavier mic like the 416 and the ktek shockmount/windscreen it really makes it a lot easier to balance.
two extremes.
the first one was a great first boom for me and i'd never sell it.
its still quite useful.
the second one cost more than my first car but it is a great piece of gear that is made really well and it will get a lot of use.
with the prices being what they are for carbon non-cabled poles like the gitzo i don't see any need to get an aluminum pole.
You're seeing something else... not a real boom pole... sometimes what is called a "mic boom" is a little arm that only extends the mic off of a stand by a few feet. Like if you want to sing into a microphone the stand base is in your way... then you use a little (and I mean little) boom arm so that you can sing into the mic w/o kicking the stand base. Not exactly what you're looking for I'm sure.
The best bang for buck boom is either a Gitzo 7680c for about $219 from Adorama... no cable, but great 13' pole.
or a K-Tek ALUMINUM avalon w/ internal coiled cable... apparently $199 from enggadgets.com... and about $219 from anyplace else... this one goes to 9'.
Either is a bargain for what you're getting... there is no better boom pole value out there.