Alf - The Tavor takes standard AR magazines.
As for bullpups, I am a huge fan, even though I have never owned one. I have relatively short arms, and every bullpup I've held/used (PS90, Tavor) fits beautifully.
I want a Kel-Tec RFB in the worst way to replace my other 7.62 rifles, but I have yet to find a dealer who has even seen one, let alone had one in stock. They also take rather pricey FAL/DSA magazines.
And the Tavor? Major want. $1700 seems to be pretty much the street price these days, so it is a lot of cash over a standard M4-gery.
And, yeah, the triggers, but I have no doubt that Geissele or CMC will come up with something.