Just for the record, I agree homebrewer that your plants are nitrogen deficient. I also belive that plants should be flushed prior to harvest to get a smoother smoke but during early to mid flowering you want some nitrogen. On the other hand, I belive homebrewer's show examples of excess nitrogen (dark green leaves and brown tips) LOL it's like examples of 2 extremes like a FAQ.
Anyways, I have used many banks to get seeds from never had a bad experience. Really just depends on who's got the seeds I want in stock and who's the cheapest or has the best deals going on ATM. I have used drchronic,drgreenthumb,sanniesshop,hempdepot,speedyseedz and currently waiting on an order from attitude. I really like being able to buy a few single seeds and they have a large selection of things I cant find anywhere else for much cheaper than others. Sannies got some good deals going on right now too. For a first grow I'd recommend some budget priced seeds like KC Brains, Cannacopia or nirvana or something like that.