I agree if you want those fish, which ain't cheap, you should be willing to put some money behind providing a proper environment for them. There is more to LR than biological filtration. Far more. Those aren't cheap or hardy fish and I don't think you will get by easily with the minimum, IMO without losing money by losing the fish. Go with one or two of the fancy fish, and spend the rest on LR etc. Shop around, get some deals or make your own rock and get seed LR for the rest, be patient, but don't go for the bare minimum. It is not doing yourself or the fish any favors.
If the majority of people could keep such fish doing the bare minimum and it usually worked, why would we all be wasting money on LR and such?