you should check out c99.. there are a few breeders offering c99 in seed form today...
it's a very nice plant, has more of a pineapple smell to it that i love.. yields very nice, and best of all, it has around an 8 week flower time to it, which is just awesome for a sativa dom strain imo..
some other choices would be hmmm... diesel is nice.. i was just growing purple berry diesel from canna venture and was super excited about it, but the two i had going turned out to be males, so i yanked both of them..
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jack herer is also nice, but the version from sensi can be a bit picky to grow,h so not recommended for new growers... but sannies seed shop has a nice version simply called jack i do believe.. sannies also has a few other nice sativa dom strains, i really loved the chocolate rain that you can get from his site as well...