I recommend dwarfpool and their eth-proxy. I have had no issues with my 1 R9 280x card running on my home computer for about 2 weeks. Have been paid just over 6 ETH so far. I found the stats took a little while to register but shouldn’t have any problem if your use the proxy they provide with fall back options. Below is the basic script I am running to kick off my proxy and also start mining. Getting 20-25 MH with 1 R9 280x with stock settings.
start /min C:\eth-proxy\eth-proxy.exe
setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
"%programfiles%\Ethereum 0.9.41\Release\ethminer.exe" --farm-recheck 200 --cl-local-work 256 --cl-global-work 8192 -G -F http://127.0.0.1:8080/
Just wish I held onto my old 6 x R9 280x card rigs back when it was profitable mining litecoin