hmmm.... although i got mz-rh1, but it's so expensive there, mz-nh1 surface got problems also, so i suggest mz-rh10 would be a good choice, u can still find it on ebay with reasonable price. if u have enough budget, then choose RH1 without any doubt.
Hi-MD could use for data transfer but i never do that, coz the speed is to slow, any with 1GB, i don't think you will use it for storage. besides, with hi-md blank disc, i could fulfill with around 60 songs in 352kHz quality.
SonicStage 4.3 maybe the best transfer software you can using~ i'm using VMware fusion on my mac, but i still using my HP elite book to run that dirty jobs, download, transfer and watch japanese AV.