It might be worth waiting until next month if you are going to be building a low cost AMD based system as prices on the A8-5600K, FX-8320, FX-6300 and FX-4300 will be dropping in April.  You can also expect to see the A4-4000 hit stores the following month at a very low price according to DigiTimes but don't have anything new to report about the release date of the Richland chips.  It is nice to have low cost CPUs available on the market, but it seems odd when even the lowest priced motherboard will run you about twice as much as the CPU you will be putting on it.

"AMD plans to cut some of its APU prices at the end of April to welcome its next-generation Richland APUs, set for launch in early June, according to sources from PC players.

Prices of AMD's APUs including A8-5600K, FX-8320, FX-6300 and FX-4300 will see 8-15% drops and the CPU maker will also start shipping its A4-4000 in mid-April for sales in mid-May priced at US$40."

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