i think ur dealers are misleading u. You wont have problem with 80 GB HDs. The following is excerpt from
http://www.dewassoc.com/kbase/hard_d...e_barriers.htm showing that u can even install 160 GB hds.
In order for you system to recognize more than 137 GB you will need to utilize one of the following recommended solutions:
If you have a motherboard that has a Intel chipset (810, 810E, 810E2, 815, 815, 815E, 815EP, 815P, 820, 820E, 830M, 830MP, 830MG, 840, 845, 850, or 860) please visit Intel's web site and download the Intel Application Accelerator. Intel's Application Accelerator supports the full capacity of drives larger than 137 GB.
If you do not have a motherboard that has a Intel chipset then it is recommended that you purchase an Ultra ATA 133 PCI card that supports 48 bit Logical Block Addressing (LBA). You can purchase the Maxtor Ultra ATA 133 PCI Card, which supports drives that are larger than 137 GB, directly from us or your local distributor.
Regarding Seagate/Hitachi, I have used Seagate quite frequently and they work quite fine. In fact, in my dad's office, we have old Seagate HDs about 10 years old still running. Be sure to check out warranty and availability of service (in case u have a problem) in your locality before u finalize.
Hope that helps,
Arun