Limited disagreement from me. Two things you should know. 1) As editions and armybooks come and go, everything alternates between meh and awesome, so don't be disappointed if your purchases pan out as week today- in a few years they'll come back to the new hotness. 2) This hobby can get expensive, so a few tips:
GW makes great metallics, washes, and sprays, and good paint. For regular paints, Vallejo is cheaper and just as good to better. For metallics, they are close. Most serious painters seem to use a mix of the two. If serious about that side of it, an airbrush and the big paint set are actually worth the outlay.
GW doesn't do a lot of really good discounts, but their starter sets are typically really nice value. Right now, Dark Vengeance is great, as is Betrayal at Calth. For Marines, the Dark Angels DV addon bundle and Getting Started with Marines kit are also both great value. If you definitely want that thousand points, any of them are good- and that includes getting a second DV set. I did, and I have over 20000 points of marines.
Hope it helps!