Do yourselves a favour guys don't buy IBM if you value your data, they have the highest faliure rate in the industry (by a hugh margin!), well they did before they off loaded there hard drive division because of all the problems they have had with the GXP series of drives.
I'll tell you how bad it is, if one of you offered me one of their drives free, I would chuckle and politely decline (serious!)
If you want to get probably the best IDE drive available and data security is important to you then go for the 8mb cache western digitals, they are VERY quick have a 3 year warranty (unlike most drives today) run pretty damn cool and never had one fail ( I build systems for a living so I have used a lot of them), yes they are around the most expensive but that little extra expense is well worth it.
Regards