Just to put in my two cents.

I have the Delphi with car adapter and cassette and cigarette lighter kit (got both pieces for $100 as part of some promo). The wires are all hidden fairly well, but I will admit the FM modulator looks better. Also I used an Antenna Specialists on-glass antenna (highly recommended).

One more thing, Pro Fit mount makes a mount kit for the Rodeo that fits the VX perfect. If you go with the Delphi Unit I would really recommend it for an extra $30.00 (You can but it at xmfan.com).

I also am very happy with XM, it's a great toy for less than $10 a month.

I think I remember JoeBlack posting that he has Sirius in his VX so he could probably give you a comparison.