in P-4 Northwood (assuming you have Northwood core), the two flagship chipsets were: Intel 865 and Intel 875, and I fyou dont want to spend extra, but at the same time want performance and stability in Budget, go for the 865 chipset board, and in Mnaufacturer I'll recommend Asus, though those who have been using GiGa-Byte, ABit, MSI, is saying their's best, are not wrong as no body manufacturers rubbish in this competitve age of manufacturers. I had used Giga-Byte before, very nice, very stable, precisously I recommended Asus as their Motherboards have won many awards. I am not an over clocker, but requires stability and performance in normal Mode, which I have found out of Asus.
Recommended Motherboards: Asus P4P800 - Deluxe (I have used a range of Motherboards from Asus, on both AMD and Intel Platform. and never felt like regretting)