what i have used and what i like and don't like:

melitta #4 cone,and snow peak folding coffee drip: they make a good cup of coffee, and cleanup is just throwing your filter and grounds away, but i don't like to deal with paper filters. if you want a longer brew time, you can make coffee cowboy style and let it steep for a bit, and then filter. if i was making coffee for more than 1 person, i think i would use either a melitta filter cone or a gold-plated permanent filter cone.

lexan presspot (french press) and mug with presspot lid: makes a strong, oily cup with a bit of sediment. i find them to be a bit tedious to clean, and they can be a bit awkwardly shaped and do not easily pack with the rest of my stuff. mugs with presspot lids tend to overbrew if you do not remove the grounds until you are finished drinking.

moka pot (stovetop espresso): imo, probably the most delicious coffee you can make in camp, but i find they generally do not make a large-enough serving to satisfy pathetic coffee addicts such as myself. again, size and awkward shape can cause packing issues.

msr mugmate: what i usually like to use when i travel. light, compact, easy to clean, and makes an adequately large, personal cup of coffee if you fill it nearly full of grounds. i think any sort of permanent filter does the same thing, but the mugmate seems to be the right size and shape for travel.

i like to make coffee before going to bed and storing it in a thermos so i can have warm-hot coffee as i wake up. i make another thermos during breakfast if time allows, and drink from that throughout the day. i bring caffeine pills when i travel so that if i am someplace where the coffee is lacking and don't want to pay 2 or 3 bucks for a monster drink, i can pop a 200mg caffeine pill. i buy "jet alert" caffeine pills from walmart (~$3/90*200mg) because they are cheap, but you can get vivarin or no-doz just about anywhere if you don't wanna give your money to walmart.

edit: matching your grind to your brewing method is as important as the beans and water you use. if you grind too fine, you will choke your filter (paper filter methods) or get a cup that is too muddy (presspot and cowboy.) i find supermarket grinders set to coarse or maybe slightly finer usually do a good grind for the above methods of brewing.