You can mount any Nikon F-Mount lens to your D60, which means back to the AI period. You just wont get full features.
Any AF lens will mount, meter and interact with the body, you just wont get AF on the D60 (you will on the D90).
As for the lens choice: 20mm is quite wide on film or the larger FX sensors (like the D700/D3/D3x) but is equivalent to 30mm on the D60/D90/Dx bodies. This means its actually closer to a normal.
If youre looking for a wide aperture lens, you can also do better than f/2.8. NIkon makes several great f/1.8 and f/1.4 (1stop and 1.66 stops faster) than the f/2.8. Things like the 50mm f/1.8, f/1.4 (both versions) and the 35mm f/1.8 all work great and cost less. The cheapest is the 50mm f/1.8, which will NOT AF on the D60, but will on the D90. There are 2 versions of the 50mm f/1.4, a D and a G series: the D will not AF, but the G will. You also pay hansomely (though even less, still, than that 20mm). The latest is the 35mm f1.8, which is designed specifically for DX (so it works great on both the D60 and D90) and has an AF-S motor, so it'll AF on all cameras. Of course, there are others: 85mm, 105mm, 135mm, 180mm, 200mm, etc. They're just much longer.
If youre looking for a wide-angle lens, then youve really only got 2 Nikon choices: the 12-24 and the 10-24, representing a 18-36 and 15-36 range, respectively. They're true ultrawides. The 12-24 is an F/4 constant whereas the 10-24 is a f/3.5-4.5 variable. Those will get you the field of view of a 20mm on FX, but not the aperture
It really depends on what youre looking for. Is it fast aperture or wide angle?
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