First, Order New re-packaged (mini) version (2001), low price season one
Yean 4980-disc 1-4 (SP-1)
Yean 4980-diac 5-7 (Sp-2)

If you like it, you can order another season package.

Double side DVD-5 looks ugly.
Just buy the low-price edition from R2, if you can not wait more time for the release of R1 ( still no announcement).

Old collection edition (Yean 15000) contain the same discs. However, each disc is in a keep case. In my opinion, there is no need to spend more 5000 dollors just to add 6 more cases.

I have old season IV-15000 and new season I-10000 (two sets), all buy from Amazon-jp one year ago.