Timing issues - Serial Response Box

[Vaaal]

Hello to everyone, 

I am struggling to get accurate reaction time without starting put my hand 
in engineering stuff, since I don't have the required knowledge to do like 
that. 
I would like to buy a Serial Response Box, but the technical details in the 
page are really not enough. I am particularly worried about the serial port 
connection. 
I know that the pooling rate of the usb port is normally 125 hz, that is 8 
milliseconds. I am able to overclock that value in order to have a pooling 
rate of 1000Hz, which is 1 milliseconds, which is quite fine. But, I am 
still not sure of the accuracy of my measurement, just because using a 
normal keyboard can add some latency in the process of transmitting 
information.  This is why I am willing to buy a professional device.

The problem is that I don't know the technical specification of a serial 
port. There is anything similar to a pooling rate of a serial port? If it 
is so, how much it is, and there is any way to overclock it? Basically how 
much accurate is the response box? 

The other option is to use DirectIN High Speed Button-Box here 
http://www.empirisoft.com/directin.aspx, which actually uses a USB port 
that I can overclock. BUT since I use E-Prime I would like to buy a piece 
of hardware that is designed to be used with E-Prime, just to avoid 
unnecessary headache in the future.

So generally my question is: what are the limit and the advantages of 
having a serial port? Do you think that the Serial Response Box is really 1 
ms accurate? Do you use any other equipment? 

Thank you for your reply,
Valerio

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