Range and the Plus has two antennas. There are a few more as well I just cannot remember. I had the XDS sold it and got the plus, I like it much better. Make sure you get an upgraded cable for it. Not the one made by X2 but one that has the HI-FI mod, yyou will be amazed. My guitarist could not tell a differance between the wireless and my monster cable.
Unless you need it right now, you could always try Sweetwater or Zzounds...they will match prices if you found a deal on one...
here is a comparison chart on thier site