Sirius
I had the Pioneer XM in the 99 truck for three years, enjoyed it and transferred it to the wife's Blazer. Got the Sirius from Tenafly Chrysler (on the web, $259 for the radio and mount plate, dealer quoted $380 when I bought the truck). Plugs right in the back of the stock radio and has read-out on the radio. Installed it myself, drilled the hole in the roof and everything. The antenna isn't too obtrusive and isn't really noticeable. About a 2 hour job all together. Although the Sirius is $12. 95/month and XM $9. 95/month, Sirius is offering a "lifetime" subscription through Jan 31, 2004 for $399. 30 months and its paid its way, no monthly/quarterly bills. As far as content, XM has a better Comedy channel, but Sirius has 3 NPR channels--XM says they will not carry NPR due to the cost. I also got tired of the "promos" XM seemed to have all the time--no commercials on a lot of the channels, but you get promo'd to death. I've seen better reception on the Sirius around town so far (had it about a month), fewer drop-outs than XM. Call me happy with the Sirius, but wouldn't be disappointed with the XM. I call it "Cable TV" for radio--won't go back to over-the-air unless nothing else was available.