skimmer wise - biggest capacity per $ is best. all 3 skimmers are in the same class. curve 9 up to 1500L, both skimz is up to 2000L. from my experience both brands produce workhorse skimmers. after sales also good since skimz is local and for bm, if u get from razali, his after sales is also good.
Biopellet - to be honest, I am using one. but for a fowlr, I think its not worth ur time running the extra equipment. I am on my last batch of biopellets and once they are finished, I will pull them out.
refugium - also not needed for fowlr. the cons outweigh the pro.
all this my opinion though. u can still run them if u like. no harm just extra maintenance.
drop by TFC. see their main tank fowlr. even if its 8ft, the sump is fairly simple. and perhaps you can get a few tips from their friendly boss as well.