Best external dial-up modem I've used; a 3COM U.S. Robotics 56K Voice Fax modem. It's pretty reliable, unless you throw it on the ground and jump up and down on it.
I greatly prefer an external modem, although they might cost a bit more. Why take up a PCI slot? External modems often have more features, and with newer operating systems, you rarely have to add a driver. You just plug it into a serial or a USB port, turn it on, and boot.
There's virtually no difference in the speed between a PCI modem and an external model, but no one would want an ISA modem unless you had no other choice. Heck, most people would prefer to stay away from ISA altogether. Talk about an outdated bus ... it's around 20 years old. If you need an ISA card, it might be time to consider upgrading ye ole' mainboard, IMHO ... unless you are a enthusiastic hobbyist, and really want to get that overclocked Pentium 90 on the 'Net.
Winmodems place too much reliance on the system, and often have more problems than any other. Software-based modems use fewer chips compared to traditional modems. The work normally done by the missing chips is transferred to software running on the host computer's main processor. If you are talking about stability and avoiding unnecessary troubleshooting, nix on the Winmodem. A Winmodem configuration can be messy, because Winmodems use a range of memory addresses instead of a fixed memory address. Winmodems require a DLL file that loads into memory at startup, using some of Windows' resources. They are usually the slowest, although you are talking about minor differences in speed between all of them, due to the speed of today's processors. It's all dial-up, anyway, even if you get a couple of PCI modems and shotgun them.
Are you stuck in an area where you can't receive Cable or DSL? Or is this a monetary issue?
Toey
<font color=red>First Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=17935" target="_new"><font color=green>Toejam31's Devastating Dalek Destroyer</font color=green></A>
<font color=red>Second Rig:</font color=red> <A HREF="http://www.anandtech.com/mysystemrig.html?rigid=15942" target="_new"><font color=green>Toey's Dynamite DDR Duron</font color=green></A>
________________________________________
<A HREF="http://www.btvillarin.com/phpBB/index.php" target="_new"><b><font color=purple>BTVILLARIN.com</font color=purple></b></A> - <i><font color=orange>A better place to be</font color=orange></i>.