I'd do that. Brother are quite behind the curve on imposing cartridge DRM, while Lexmark wrote the book on it:
They look good. There's also continuous ink systems for some models, although I think refillable cartridges are less hassle.
(Epson are also nice in that they use piezoelectric inkjets, rather than bubblejets. They will print other fluids of similar consistencies to ink - conductive polymer ink, anyone?)
Theo