Here is a good site to check:
http://come.to/cdspeed
Like the previous posts have mentioned, brand name does make a difference. I've tried quite a few (Asus, Acer, Afreey, Kenwood, Toshiba, Sony, and Teac). And the BTC's, the Smart & Friendly's, the HighVal's, etc.
You have a very good quality CDRW drive; not sure if you plan to burn audio CD's or on-the-fly burns but...if you do then it's important that you select a CDROM drive that supports DAE (digital audio extraction) at a high enough to allow on-the-fly or CDROM reader to CDRW drive burns for audio. You'll find that if you download the CDSpeed.exe utility, a LOT of drives that advertise 50x, 56x, etc. do NOT perform as advertised for either audio or data.
I have two systems and in each system I have a Kenwood UCR-421 72x CDROM reader. I read and researched practically every CDROM make, model, and manufacturer out there before I decided to try Kenwood. Kenwood's have gotten a very bad rap about pour quality drives in the past. But I believe that they have rectified these problems due to public pressure in the form of CLASSACTION LAWSUITs.
Both of my Kenwoods are fast, quiet, and extremely reliable. They both perform as advertised giving me DAE rates of 46x and max data throughput rates of 68x (according to CDSpeed and Adapcrap's test utility via ECDC 4.02 Deluxe). I have no problems with getting them to read burned CD-R disks (I can't vouch for CDRW disks since I rarely use them), audio CD's, and data CDROM's. I've even been able to copy scratched audio CD's and data CDROM's on-the-fly always at 8x.
For you, it's really important to have a CDROM reader that can keep up with your 12x burner. The Kenwood's use a different technology to achieve high throughput; they don't have to spin to high RPM 's to achieve high data rates. That's the beauty of them (nice and QUIET); I ran into problems with my Afreey 50x ($35.00, good price but NOISY and unreliable) unit spinning down at the tail end of a burn for some reason (couldn't adjust this like the Teac's; Teac's can be adjusted using a s/w utility; Teac makes a good IDE CDROM drive) causing buffer underruns resulting in coasters after burning 95% of the data, a real pisser!!!
I paid $90.00 for each of my Kenwood's but I've noticed that the prices are starting to creep downward, $80-85 a piece. Yeah that's double what you can get an Asus 50x unit or Afreey 56x unit for but there is no comparison; the Kenwoods ROCK! But if you're willing to shell out for SCSI then yeah Plextor makes the best SCSI reader out there and that would be the ultimate mate for your PlexWriter...
You can always do like I do if you're unsure of a computer product's compatibility; find a local retailer with a liberal return policy, buy the product, test it out on your system, then if it doesn't work as advertised, return the mutha!
Heiny