The best type of Motherboard

ATX are usually full functioning desktop boards, can support 4(or 6) sticks of memory usually, many of the desktop cpus from a socket (if not all) and better built boards support more than one graphics card, usually have 5-7 expansion slots

mATX is micro ATX, the board is physically smaller, can have a reduced feature set of an ATX brother (not so much anymore though), may support a smaller amount of memory (usually through less sticks), may only usae proccessors up to a certain wattage, and usually can only have 1 graphics card (very few exceptions), usually have 3-4 expansion slots

BATX i think u mean BTX, don't know anything about that

ITX i do believe is the same thing as mITX or miniITX, think about mATX except smaller less features, less processor support, ond usually only 1 expansion slot

extended ATX or eATX is a larger form of ATX, more features, sometimes dual or quad processor support (workstation/server CPU's only aka opteron or xeon), more memory

cheapest: mATX is usually the cheapest (miniITX tends to be expensive because of such small size, eATX since it is server oriented)

price/performance: depends on what u are going, though, i tend to stick to ATX for gaming and mATX for HTPC (maybe miniITX if it needs to be very small or low power), defiantly ATX for multi GPU gaming

best: like above. depends on need, thoug raw performance might be eATX, though u probably don't need anymore than ATX

not all of these boards fit in an ATX case, you have to check the manufacturer to see what boards fit/have holes in the tray in the correct positions

not really stupid questions, but easily found through google or wikipedia + knowing what you need

Anyone?

Cool, Thanks Gondo