If you go for XPS then really be careful about coil-like noise (google for "dell xps coil whine forum"). Dell doesn't consider this to be a fault - it's "normal

If you go for XPS then really be careful about coil-like noise (google for "dell xps coil whine forum"). Dell doesn't consider this to be a fault - it's "normal" from their point of view. And for you such coil whine could be like chinese water torture - constant pain.