Pc magazine middle & near east tested 23 motherboard for socket 370, socket A and socket 423(for P4 or 428 i forgot) and the editors choice for socket 370 goes to Gigabyte GA-60XET and for socket A it goes to Gigabyte GA-7DXR.
Check out the September issue. i would like to post the result but unfortonately i dont have a scanner.
most of the mother boards produced lately (after june-2001) specially the famous marks like giga byte are including a 4x agp slot
but there is some which is supporting the 4x agp PRO which i have in my own soltek mother board which have the same desighn of the giga byte mother board of that model.