If you have a good quality CD burner to begin with there is less chance in making 'coasters.'
Plextor is the burner I chose a few years back after reading reports on its great performance with all media used overall. Quite a few salesmen commented back then they considered Plextor the top burner out, one even said "it would burn any media and would probably even burn on a postcard if inserted!" That sold me. Still use that 4 year old Plextor burner and can honestly say I haven't made a single coaster! Have used all types of media from 'brand name' to 'no-name' and they all worked flawlessly.
BTW burned a couple hundred CDs so far with 0 coasters made.
I used to bring 'em back from Sam's Club in Buffalo. 80 minute Maxell's with slim, coloured case---about 50-60 cents (Cdn) each. I've still got about 150 of them.
Just got 100 of them 80 minute Maxell's on a spindle for $15 USD @ Office Depot in Buffalo a month ago.
A Buffalo Office Max, had 100 slimline cases for free after rebate back then also.