Simply, I'm developing a wireless ECG (electrocardiogram, or EKG from the German Elektrokardiogramm) and I need to choose the best language for a desktop application that allows the following:

wireless transmission of data over WiFi
real-time graphing of ECG data signal
a good DSP library

Thanks.
From the viewpoint of a normal program (i.e., not a device driver) a Wi-Fi connection is just a network connection -- not noticeably different from (for example) a wired Ethernet connection.
Real-time graphing and digital signal processing libraries are probably a little less common, but not much. "Real time" is one of those slippery phrases that it's hard to pin down exactly what it means (different people use it differently). At a guess, you just mean you want to update the graph as data arrives. In that case, the important question is what bandwidth you're dealing with -- i.e., how many updates of how much information, how fast?
Bottom line -- none of what you've told us gives much in the way of real criteria for picking a language to use. The obvious open question would be performance -- how much data you need to process, and how much processing you need to do on it. That might at least hint at one being better than another.
ECG/EKG software language advice