I just got the R9 380 for 200$ brand new I'm going to test it out anyone have any experience with that one?
For Ethereum, R9 380 can get you 20MH/s. Do you have the 2GB version? 2GB should be slower than 4GB in the future.
That's a good price and probably worth it because a used 280X would cost ~$180. But you should be able to reach 22-23 MH/s on an R9 380. If you're comfortable with firmware flashing you could attempt to flash it to 380X firmware, it might give you a a small performance increase. I did this with my R9 290 and saw a a small increase
Also good you got the 4 GB version because 2GB cards will not be able to mine for much longer (some people have reported already they can't mine with a 2GB card)