A few weeks ago I got a Meridian Colo(u)r. It is ace. I beleive the main difference between the two receivers is that the Meridian can use SD cards for maps and route/waypoint storage, but the Sportrack cannot and is limited to its inbuilt memory.
I bought it in the States, the cost on my Credit Card was £166 including a fag lighter lead!
The best thing about the Meridian (and maybe the Sportrack, they're very similar) is that you can very easily upload new basemaps, so within a couple of hours my US basemap GPS had a European one. It was a peice of cake.
Magellan also have Directroute software in the US, which gives the GPS the ability to autoroute. They say a European version should be out in the Spring, but isn't that now?
I'm very pleased with the Meridian, and think the extra cost to use SD cards is worth it.