Doesn't matter. Tuning is key.
And unless it's a pretty damn quality box tuned at a preferable rating, no one will pay $200 for a used one. I can get a prefab box for $70 vented for 2 12s, why would I pay $200 for one?
If you're looking for a basic but quality setup, get an SA-10 or SA-12. They're 600RMS, and if you set your gains correctly on your amp, you should power it easily without putting strain on the sub or amp and it'll last you forever.
Another question... list your amp model. 4 channel vs mono, AB vs D, 1000W Peak vs 1000W RMS, all makes a difference. I used to have an amp that said 1000w on the top plate but it was a Pyramid and was really about 100-200 watts RMS.