How much lining just depends on how light or how bulky you want it. I have a warm lined parka for skiing and winter dog walking but for traveling and summer hiking I use a thinner one that packs down very small. If you are planning on wearing warm clothes underneath a thinner one will probably be fine, but if you don't want to bring warm layers, if you want the jacket itself to be warm, get a thicker one. I love Marmot products and all of my skiing and hiking jackets and pants--the ones that really need to stand up to water/snow-are Marmot, but there are tons of good brands. REI brand is often a good deal. I would avoid the really cheap brands-the seams will leak, the waterproof coating will break down, etc.
Rei-outlet.com always has good jackets inexpensively and Rei sales (on rei.com) are great. Don't get hung up on Gore-Tex--there are other good waterproofing materials (I live and hike in the Pacific NW and I've never had goretex).
A lot of the hoods in the roll-up jackets are insubstantial and the brims really don't keep rain off your face--that is one thing to watch out for if you want a hood.
I've never thought twice about the number of pockets. I just need 2 for my hands. Although an interior pocket is nice when traveling, so you can keep your wallet safe.