I think CDRInfo does the best tests. You will find tests for almost all of the current burners on this page:
http://www.cdr-info.com/hardware/ Each test is about 8 pages long, so make sure to scroll through as they list the advantages and disadvantages on the last page.
They have only one 24X or faster burner that they gave an Editors Choice Award to and that is the 24X Teac. It has the best error correction of any current burner, defeats all of the copy protections and is one of the few current burners that has hardware support for the new Mt Rainier format which can replace the floppy. Newegg has it for $125 with free shipping but unfortunately they only have it currently in black:
http://www.newegg.com/app/ViewProduct.asp?submit=manufactory&catalog=5&manufactory=1110&DEPA=1 Maybe you could do better through
www.pricewatch.com Be careful as there are places that lowball the price and then rape you on shipping.
The best price right now on a competent burner is the 24X Lite-On. Its error correction can't match the Teac but is better than the 24X Plextor. It also defeats all the copy protections and isnt media picky like the Plextor. It doesnt support Mt Rainier. Newegg has it for $89 delivered.
http://www.newegg.com/app/ViewProduct.asp?submit=manufactory&catalog=5&manufactory=1336&DEPA=1 Dont get the OEM with the retail box only $2 more.
CDRInfo doesnt list a test for the 32X Lite-On but there is one here:
http://www.cdrlabs.com/review.php3?reviewid=94 They seem to be reaching the point of diminishing returns with burner speeds as both the Mitsumi and Lite-On 32X burners beat the 24X machines by only a few seconds. The Lite-On 32X evidently doesnt have Mt Rainier support.
I think that 24X Teac is the burner of choice at any price right now and the Lite-On is a good burner at an excellent price.
It seems you already have a SCSI card. You might have to update the card if it is an old SCSI 1 card, but you can get a Tekram SCSI 2 card cheap that will support a 24X burner. I have an IDE system as far as the HD goes, but have 5 SCSI devices including a Plextor burner and CD-ROM. There isnt any problem mixing them. Im waiting for a decent fast SCSI burner that will defeat all of the current copy protections. Im just snobby about SCSI, but IDE works fine these days. The problem is that the Sanyo is the only fast SCSI burner on the market, and as usual Sanyo is behind in defeating all of the copy protections. I wish Teac would make a fast SCSI burner.