actually both of them have the same specs (just different package contents)... depends if you want a funky XM phone or a serious looking classy business phone...
I'd prefer the E52 anyways... XM series feel so cheap coz of the plastic
gr8!! now i need think which one to go for, 5800 or e52 or anything just around them. hope it will shed 2k in 2months or so. may be 5630 will be priced lower than that.