RedHat Which Version? and USB woes

Hi Guys
I am running now on UNIX SCO 5.0.5 platform
I am running 25 WY50 terminals and other serial devices, using 2 serial port-servers with 16 ports each.
I would like to switch to my OS to REDHAT Linux
Dell is offering me  4 choices  for REDHAT: ES4.1,  ES4.3, AS4.1,  AS4.3
My first question is:
Which one should I choose and why?

I would like to remain with my WYSE 50's and use the existing serial connection and cabling
because I am using an all-text Accounting-Application and "dumb terminals" do the job.
I would like Hoever to switch these 'serial port-servers' setup,  with "USB-to-Serial" port-servers
My second question is:
Am I looking for trouble using "USB to Serial"
Should I expect to have real "plug & play" here where adding a device is a breeze
or am I looking for problems?
Thank you for your help
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Devices with USB Serial Class support will work, others will not.
ES is cheaper, otherwise small differences,

Other Linux distributions (Mandriva,SuSE,Fedora) do not limit number of usable CPUs
Others do not even charge for premium releases like ubuntu for more info

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actally ES is same as WS at larger price....

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept gheist http:#16395304

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

EE Cleanup Volunteer
dory550Author Commented:
I am sorry
I comletely forgot that I had an open question on this forum
I accepted your answer and would like to thanks you for your help
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