I would personally start having a look at both Emerald Triangle and TGA. Both seem to be throwing out some serious fire.
With more info we can be more specific on what strain to grow. What sort of high do you want, yield, flavour etc etc...answers to those q's and others will give us enough info to give you some ideas of some strains to grow...
If you don't know exactly what you want, then I would suggest having a look at some seedbanks on the internet.
Attitude and
Herbies Head Shop are two that come to mind. Have a look through TGA and Emerald Triangle's strains and read the descriptions...that will help you make up your mind up I hope.
One rule of thumb I would use is not to get feminized seeds. I think you will find that the seedbanks that still offer regular seeds or ONLY regular seeds are more likely to be offering seeds with better genetics. Is only a rule of thumb though.
Cheers