2abbey,
sata wont be more reliable as far as the build is concerned there is nothing new about the construction, I believe that manufacturers will offer sata and ide versions of drives using the same construction, there is one area where I personally think they may be slightly more reliable discussed below. However at the moment Sata doesn't offer much over ide/ata as it is still more expensive and disk performance is not a limiting factor for most PC's , I think this will change soon when the prices drop a bit and I would not be surprised to see them dominant in about 18 months.
I have also used WD drives and until recently I hadn't had one fail, the drive I have in my main PC which is a SFF Shuttle is starting to get noisy, I will replace it soon before it fails, Although it has worked very hard and is normally switched on for 24 hours a day I think the fact that it is running in a hotter environment than is ideal may have hastened its demise. This is one minor area where sata drives could be worth having, as they have very slim connection cables which mean that the PC insides can be kept cooler with better airflow. I have a feeling that high performance PCs which produce a lot of heat my be one of the reasons why disk drive failures do not seem to be uncommon, I don't have any hard facts to prove this but I have noticed that many PC's run much hotter than they did a couple of years ago.
My advice on which drives to buy? make sure you keep good backups of important data and then buy well known brand named drives and keep one as a spare, they are so cheap now that its not a big deal to replace a drive. WD are very good but most of the known brands you can find somewhere like
http://www.ebuyer.co.uk are fine for most users.
I am a long term fan of IBM for disk drives as they have been very active in pushing DD technology forward but I have had several of their recent drives fail and a quick google search will show that I am not the only one. So for now I would not use IBM.