I am using Flourish and Flourish Excel in conjunction with each other at the moment.
It would be nice to have all the seachem products but that would not be very economical
Thats why Flourish is good because it contains all the trace elements iron, calcium etc....
Flourish does not smell good like flourish excel does though lol xD
Also you should try the flourish root tabs as some plants absorb nutrients through their roots and others through their leaves.
Other than Seachem I have also heard good things about API. Although I cannot comment as I have never used any of their products.