AT has already answered in the most convincing manner...there's no BEST skimmer...
buy something tat u feel is good enough for yourself and your tank...make it affordable (price and running cost)...
as a DIYer myself, i feel that the best thing about DIYed products is that u can customise almost every single detail...but if u buy a reputed brand, eg: H&S / Deltec, i dun think they will make a customised set just for u to fit into your cabinet and sump...although certain BRANDS allow customising, its still very minimal...
and not forgetting, if we are talking bout local DIYers, we can always count on customer service (to a certain extend)...