Not really in hurry. I KNOW there are no 8x DVD+RW media available on open market, not in South Korea, and not even in Tokyo and Singapore and Hong Kong. The few 8x DVD+RW and 6x DVD-RW media seen on this forum were the very sample disks delivered directly from Mitsubishi, JVC, and other leading developers. I haven't seen any 8x DVD+RW media myself.
Because of verification process, 5x DVD-RAm works like 2.5x and 3x DVD-RAM like 1.5x. 4x DVD+RW is faster than 5x DVD-RAM. Reading is also faster with DVD+RW media. 5x DVD-RAM can be read as fast as 5x only while many DVD+RW media can be read at 6x and over. However, for random read and write, DVD-RAM works a lot faster.