Honestly any nute with good amounts of P and K in it. Brands are more or less meaningless. I honestly prefer dry nutes as you get more for your money. Check out bud explosion from Greenleaf nutrients for a cheap, no-frills bud booster. Its what I use along with megacrop from them. It works quite well and is very concentrated so a little goes a long way. I would buy it directly from Greenleaf nutrients as they have it the cheapest I've seen.