Out of interest are there are any AMD notebooks available in your pricerange?? If they have HD3200 or Nvidia 8200 or 8300 integrated graphics they will a few times faster than a GMA X4500.
Also since the notebooks are so close together in spec the best thing is to actually look at the notebooks in person
TBH. Also look at the warranty you will get with them too.
The HP has a number pad though unlike most notebooks which may prove useful. The Dell 1545 is a bit cheap in finish
IMHO and does not seem as durable as some of their other previous budget notebooks.