its actually a pretty well written post but its going to be tough to pick a pipe based on what you have told us.
if you're just looking for a pure top end boost, and don't mind loosing some low end, the boss is the highest rpm pipe.
my all time favorite stock puch pipe is a proma GP it has great torque and pulls strong through the midrange, but it doesn't rev as high as the boss. For my tastes, it is worth the loss in top speed because the bike is so much quicker and more fun to ride. If you want to get more top speed out of it, you can add a lot of porting with the GP and not loose all your low end.
the tecno circuit is good midrange too, but like all circuit pipes it is more likely to crack and get messed up on curbs and stuff. It doesn't offer as good of low end as the proma GP, but it does have better midrange and a more noticeable 'hit' especially with some porting.
the estoril is not a pipe i tend to choose for stock cylinders, its big and clunky and hits your ankle and usually requires bullshit to mount up. I like it for conservative kit builds in its stock (restricted) form, and its a ripper on top when unrestricted.
if you plan on eventually kitting, the Proma Circuit is a great pipe on kits, and OK on stock, but its low quality, loud, and doesn't do much until you port.
I avoid the bullets/biturbos at all costs because they are loud and annoying and i've spent way too many miles stuck behind them at rallies to ever willingly listen to one. They also kill your bottom end and midrange in exchange for a minor boost on top. Some people love them, i think most people think they are faster than they really are, because the poopey midrange makes you feel the pipe 'hitting' harder, just because it goes from totally sucking to less sucking.
I guarantee that if you put a Proma GP on your bike you will be happy, and you will blast anyone else you ride with. Usually you pass everyone (including kitted bikes) taking off from a light with very little fanfare, then they all get up to speed about 3 blocks later to go screaming by you just in time for them to hit the brakes again.