the CPU / motherboard will determine if you need a 20pin or 20+4pin

If you get a powersupply that has 20+4 pin you should be covered either way.

The motherboard you listed has this posted in it's "specs":
One 24-Pin power connector with full ridge
One 4-Pin power connector

This would mean you need a 24pin and an additional 4 pin
Most higher end powersupplies will have the connectors you need.

FYI I recently bought a "budget" power supply, 600w for $30 and it didn't have the 4pin power connector so I used an adapter off of the 12v rail and it ended up melting that cable because the power draw was too high.

Since this experience I've realized it's better to spend a bit more on a power supply that is of higher quality (I use newegg.com for reviews and you could lookup your CPU to see what kind of power supply people are using with it).

hope that helps ya out