I use a Mr. Coffee that I have had since the 1990's. You see so many on the market these days from a pretty low price to some really high prices for so called high end makers. I think it's time to consider a new coffee maker. My questions are:
Does it make any difference in terms of the taste of the coffee made?
Which one would you recommend under $100?
Do you use distilled water or straight tap water-well or chlorinated public water? Make any difference in flavor?
I think the freshness of the ground coffee makes more difference than any of these variables in terms of flavor.
Taste is usually subjective and opinions will vary. With that said,
1. Yes the higher end ones can make your coffee taste better by using preinfusion, the way it saturates the grinds, temperature control, sometimes built in water filtration, type of filter, etc.
2. Depends on what your priority levels are. Type of brewer ( auto or manual, syphon, moka, aero, french press, etc.)? How much money do you want to spend ($100 for you but I mentioned it for other members)? Convenience (easy to difficult)? How much and how often do you plan on making coffee (capacity)? Features? How much control over the variables do you want (simple to complex)? Aesthetics/dimensions (classic or modern design and size)?
Auto drip brewers do not deliver the best results but they are fast, convenient, and there are many many auto brewers to choose from. SCAA certified will usually be of the best quality and consistency but probably more expensive. The best will have features like: Showering of the water delivery pattern ensuring complete saturation of the coffee bed, preinfusion mode, filter type, built in filtration, and temperature control features.
Mark Prince from Coffee Geek suggests for the Classic looking auto drip brewer, Capresso CM200 Auto Drip Coffee Maker for $70, Behmor Brazen Plus Auto Drip Coffee Brewer for $199, and the Bonavita BV1900TS Thermal Carafe Brewer for $180.
3. The SCCA standard says you usually want you your Ph level 7 neutral and your mineral content around 150 ppm. Do not use distilled water to make coffee as it has its mineral contents removed and can strip them from other sources such as you or the pot you used. The water can also taste flat and can mess up the flavor with whatever its mixed with. Some City's municipal water systems are great for coffee while others have too much chlorine and less than nominal ppm. You can check out your ppm with a free ppm meter from a zero water kit. I myself use bottled Crystal Geyser Alpine spring water.
4. The best variable in coffee is developing your mind and your palate. The best variable in coffee equipment will actually be your grinder. It is not the most glamours of toys but it will be a major factor on how your coffee can taste. To maximize your flavor fresh ground is always the best where preground can stale quickly.