WD is way less noisy than samsung, I own all brands of hdd's atm, in terms of noise its like this in my experiance:
Seek noise, top= noisy, down = silent
Maxtor (dmax9&10) (noisiest)
Samsung (spinpoint)
Seagate (7200.10 series, dont know about older ones)
Hitachi (dekstar)
Western digital (caviar) (most silent drive in my pc)
Spin noise
Maxtor dmax10/9 (noisiest)
Seagate 7200.10 (depends on motor)
Hitachi dekstar
Western digital caviar
Samsung spinpoint (most silent spin)
As for heat: My hitachi and WD are usually very cool, sub 35, my maxtors are around 35c, and i can't measure the seagates as smart doesnt work on raided hdd's, but they are hot to the touch, my guess is 45 C.
Get sata as its more future proof and new mobos have more sata's than ide's these days, in terms of performance it doesn't make the tiniest bit of difference with a single drive if its ata133 or sata (be it sata 150 or 300) , its the generation of the drive that matters, ie. 7200.10 is faster as 7200.7 series baracudda's.