Hi Mark,
Stick with a Win7 laptop due to compatibility with astro programs (some will work with Win8, some wont). Core i5 minimum, 8GB RAM minimum, SSD works well but cost of space can be an issue (largest commodity size is 250GB).
I have 2 HDDs in mine, one SSD internal (250GB) and one normal (500G) in the a caddy where my DVD normally sits
Aim to spend around $1000-1500.
Brands are much the same, no great quality difference.
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