Well if you want good you should go with Fox Farms. Grow Big for veg (24-0 or 18-6 light schedule) and Tiger Bloom for budding (12-12 light schedule). If you want cheap, just ask what the cheapest liquid nutrients are at the local garden shop. But seriously, when you consider the yield difference it's MUCH more practical to go with the better nutrients. A $20 bottle of Fox Farms will last you forever if you aren't running a huge grow op or something.
i use the whole foxfarm line for my hydro setup and have had great results with them. they are also very affordable and they get the job done.