As stated above, alot depends on what your standalone can play, luckily mine can play both + or - as well as +rw.
You should check out
www.dvdrhelp.com they have an excellent data base(s) for burners, standalones and media. People there report their experiences with the aboves combinations. I'm sure you'll find your burner and standalone in them, it should help you find the right combination for compatability and longjevity. Also the general concensus over at Afterdawn.com seem to prefer Ritek media.
You can also download a cool little program DVDinfoPro it can identify your media as well as your burner(s) capabilitys. Comes in quite handy for helping you to tweak settings in your ripping/burning programs. The freeware version has adware in it though
but I've learned to live with it for now.
http://www.dvdinfopro.com/
It came in handy last weekend when Best Buy had Imations +/- on sale 50 for 59.99.
Alot of people at Afterdawn said they were garbage made by CMC turned out just the - were. The +'s were made by Ricoh burn at 2.4x no coasters so far even burned one at 4X.