It's kind of hard to say what would be best. If you are thinking very long term, trying to go solid state is probably best option. I would search and read about the SCSI2SD product as it seems to be a favorable option and is slightly lower in cost than the SCSI - CF option. But you say your model is capped at 5--(MB/s?) the SCSI2SD will not go that fast, but you might not really notice.