I run Bosch "Green tops" in my turbo'd VW. The "highest quality" e bays one looks just like the classic green tops, but are probably just cheaper knock offs. The Bosch greenies are the newer version of the green tops; some people refer to them as "Green Giants." I believe they are just a replacement for the older style green tops.
I would go for the genuine Bosch ones. If you are planning on running more than one injector, they are flow matched, which can help avoid lean/ rich cylinders, depending on how the plenum is built (ie. one injector per cylinder). They also will most likely have a better spray pattern, but it's hard to know without side by side testing. I seem to remember reading that the tips have a different design and the newer ones help with atomization.
The cheaper ones may be just fine though, and for the price you could buy a few and pick the ones that spec out right where you want. It's fairly easy to rig up an injector tester/ cleaner.
I've also seen sets of 4, so maybe that would be a better way to go instead of buying 8. Another option would be to buy a used set and clean/ flow them, and you still would be less than the new green.
Regardless of what you choose, if it's not exactly what MS recommends, make sure they are the same impedance, as that would cause major headaches.
These may be worth checking on:http://forums.vwvortex.com/showthread.php?6707409-FS-Bosch-green-top-injectors-440cc&highlight=green+top
Lots of others for sale over there too.