It's somewhat amusing to watch all the replies.
A while back I ran a poll on lens system design.
I put ranges for minimum focal length, maximum focal length and whether this should be zooms or primes.
the posts here reflect the variation in the poll quite well.
Minimum focal length averaged out to about 14mm with a wide flat distribution from 10mm to 17mm.
Maximum went beyond 200 mm as an average, and it was split 50-50 zooms and primes.
For what it's worth, I consider my Kit ideal (Naturally every one is probably the same
)
3 zooms form the backbone
Sigma 10-20 F4-5.6
Tamron 28-75 F2.8
Sigma APO 70-200F2.8 EX (non DG Non Macro)
I then can add in what ever I want out of my remaining (40) lenses but these days it is my 8mm fisheye and 85mmF1.4.
My sigma is I think the sharpest of all the versions especially at the long end. Later Macro versions were reported soft at th elong end. The Tam,my can do close focus (not true macro) but I believe that close focus is good enough unless you specifically plan to do macro work. The sigma 10-20 is getting a little old, and the newer version is 1/2 to 1 1/2 stops faster, which may be of use. I never found it limiting, but I can see why some would.
I think the approach of making a backbone of quality zooms, and then fill in special needs / wants with primes is one reasonable way to go. others with more limited interests seem to be happy with a bag of DA's from 15-70. It is not my approach, but if they are happy and it suits their needs I can't argue