"PLEASE DONT POST A REPLY JUST TO TELL ME WHAT LAPTOP YOU HAVE AND HOW GOOD IT IS, especially if it's not on the list or of the same spec as the others listed. I am looking for sound, informed advice here only please. Many thanks."
First of all welcome, but the above quote, however well meant, is not really within the spirit of what Helprooms are about. If you post then you will get contributions and its down to you to think and select.
I have none of the listed items but for reliabilty issues would choose the Acer. Given the closeness of Vista can you wait, the investment is significant?