Who did you order it from? Companies sell OEM products and will say "OEM" "Bulk" or "Drive Only". This is less expensive than a retail kit and convenient for people who only need the drive. You need to check on the order and find out exactly what you're getting. If it's a kit, you should get the drive, adapter card, cable, and software. If it's OEM, you'll only get the drive, but hopefully they included software.
Ultra wide is overkill for a CDR, and if it only has 68 pin connectors it won't even fit a CDR drive (2940U2W, I think, has both 50 and 68 pins on separate buses). If you need an adapter card, make sure it's 50 pin. Fast SCSI 2 is all you need.
www.ic-direct.com and
www.hypermicro.com has the Tekram DC-390 for $45, IC-Direct has Adaptec 2910C for $75. Plextor is bundling Adaptec 2930C with the 8/20 CDR, if you want to look into that card also.
SCSI is faster, but IDE is not far behind these days. The superiority of SCSI is mostly in it's bus mastering. It can handle multitasking peripherals better than IDE.
I went with a Ricoh IDE CDRW because I'm not going to be doing anything else with my PC when I'm burning CDs. Maximum PC gave them a good write up, and I haven't heard anything bad about them. It has 120 ms seek, 2 MB buffer, it's rewritable 4x4x20, and I got it for $249 OEM with Adaptec software, so I gave it a shot. I haven't used it for burning CDs yet, but we'll see if I did the right thing.
I wouldn't worry too much about the card. If you got the CDR from a reputable company, you probably got it for less than a kit. It'll just end up being inconvenient for you too have to order an adapter, and you can't get a better CDR than a Plextor. Just ask Dragon