Unhesitatingly, I'd recommend the Saiga, for two reasons:
1. You save a bunch of money, and for a "plinking" gun, you don't need the hi-caps.
2. The build quality of the Saiga is light-years ahead of the cheap AK knock-offs.
Also, if you want to spend $339, buy the Saiga, and get a drop-in trigger group, new furniture (I recommend K-VAR) including a pistol grip, and modify the Saiga to a full-blown AK-47 configuration. You can do it for under $339, including the cost of the rifle itself, and you will have a very much superior rifle in terms of both initial build quality and in terms of parts quality (stock, trigger, etc.). You can also order the stock a bit longer than the standard AK stock, which is a better fit for most shooters.
In case you were wondering, I have both weapons, and I'm in the process of converting my Saiga now. I expect it to be a significantly higher-quality weapon than the WASR by the time it's finished.