Any standard filter machine (Russell Hobbs one I think I have) will do fine. I only use my filter machine for making large quantities of coffee. Caffetiere/French Press works because it's so simple and natural. Filter coffee filters out some of the oils that can add that extra richness. There are also pourover devices in from companies like Hario too which a lot of people like.
I used to make some in the morning then put the rest in a good thermos straight away and it keeps hot for ages whilst not ruining it like a hot plate which is basically cooking.
I leave espresso to the pros in soho, there are some fantastic (mostly antipodean run) places in central London.
Re Americano, a good americano is supposed to taste like watered down espresso, but if you have good espresso this can work very well indeed, also the chains will usually add way too much water to it. Much easier to make a good filtered coffee though and the range on offer just from the supermarkets is excellent. Some Starbucks blends are good too, special edition blends are almost always a good shout and the sumatra is really top notch (some are completely naff though
IMO).
I am tempted to get an aeropress, never got round to it. The best description I've read is that it's most similar to moka pot coffee. It's close to espresso strength but without the unique espresso flavour. I imagine it's a great way of making home made lattes.