Slow wireless speeds on Mac Pro, but only downloads???

I have an "early 2009" quad-core Mac Pro. I also have a Macbook Pro that's a couple of years old. I'm running speedtest.net, with the laptop sitting on top of the Pro. My wireless setup is a several-year-old Airport Extreme base station hard-wired to the Verizon router.
My FiOS speed is 25/15, and that is generally what the laptop gets. When I first started this saga, the Mac Pro was getting about 4/12 on wireless (it is just as fast as the laptop if I hard-wire it). The laptop is also able to see about twice as many wireless networks as the Pro.
I have had the Pro in to the Genius Bar 3 times over the last couple of weeks. I give them credit for trying really hard; they say it actually has better wireless speeds in their store than one of their own Mac Pros, so they are chasing a problem they can't reproduce. The main thing they have done so far is replace the Airport card, which improved my results to about 9/17, but here we seem to be stuck. At this point the store has done everything they can think of, and all they can offer is to give me the names of some Apple certified techs who can come out to my home office (for a fee, of course) and try to trouble-shoot it here.
What I find most perplexing about this is that it's only download speed. I would think if there was some sort of interference, which is what they are thinking, it would affect both. And it would affect the laptop too.
I have a brand-new Airport base station that I will try setting up, but I don't have high hopes. I can also try upgrading to Snow Leopard, but that is a big time sink that I'm not quite ready for yet (I like to do a full install when I upgrade).
Does anyone have any other suggestions or tips on where else to research this?
Thanks in advance!

I saw this at a site where they were using DFS with Server 2003. When the few Mac's they had connected to the actual server and uploaded the file it was okay. But when it was sending the file via the \\DFS_node\share_name the Mac took heaps longer for the same file. Watching the Activity Monitor > Network monitor you could see gaps with the data transfer, as if there was some pausing between packets. A pcap showed that there was constant DNS requests coming from the Mac, even after the connection to the share was made. The same wasn't happening when the connection via SMB was directly to the actual file server. As there was only a few Mac on site they left it with the direct connection but were getting an MS specialist in to look at it. Never heard what happened with that one but you may want to try monitoring the packet transfer to see if the data movement is contstant or breaking. I'd also recommend getting Wireshark to monitor the transfer. You can compare upload to download and maybe even the transfer from the Mac to an MS workgroup share.

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