The 5 servers I see are:

Mike's BKBS FirstStrike
Rebel Defiance
Official BlackIntel.org First Str
=SBB= First Strike
{CC} First Strike

My ping runs from 140 to 190 in the order above. (I'm guessing all these servers are across the pond from me).
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Additional info:
I run Windows XP professional with SP3, all updates current (including DirectX updates)
Processor is an Intel DualCore (6400) running at 2.13GHz
RAM is 4GB (3.37GB showing - 32bit)

System runs smooth on every game I play (2142BF, BC2, Spore, Crysis, etc...).
At idle I have only 27 processes running and 244MB of RAM used.

Error message is that I'm running an old client. First Strike Launcher version is 1015. Clicking update shows I'm current.

Edit: I have already tried some of the suggestions in the other threads I've read - deleting cache, profile, etc...

I have the Deluxe Edition bought retail (DVD-ROM).

The answer to my problem might come with Windows 7. I've been meaning to do a clean install with a copy of Windows 7 Ultimate 64bit I have. But just haven't wanted to deal with wasting an entire day reformatting, reloading everything, and configuring on that computer yet.

Edit:
The server "{CC} First Strike" is not running punkbuster and is password protected. So it might not be showing up because of certain filters you have on.
Either way, I can't connect to any of the 5 servers yet.

2142BF with the 1.51 patch was already installed and running. I downloaded the First Strike mod just 2 days ago and installed.

So 2142BF with 1.51 patch first. Then First Strike mod afterwards.