any 5sp commuter?

The three speed Sturmey Archer hub gear is an ideal commuting gear set-up, especially for flat or mildly rolling terrain, the maintenance time and costs and cleaning requirements are tiny. They only need a strip down and regrease periodically and there is plenty of info on the net about how: it is not rocket science, I could do it by the age of 12!

However they are usually found on rather heavy and slow 'upright' bikes not designed or suitable for longer commutes. If you have a good frame with horizontal dropouts you could build yourself/have built a drop bar three speed commuter, add SA drum brakes and you will hardly ever need to do anything to the bike except oil the chain and pump up the tyres. SA also do a 5 speed hub gear, but the 3 is lighter and less fussy about gear cable adjustment. Also the more gears, the more complex the hub internals and the more likely they are to need special tools. My first drop bar bike, a boys Hercules Hustler, had a 3 speed SA hub, but I never really appreciated how good it was until after when using derailleur geared bikes to commute.

SRAM and Shimano also do 3 speed hubs but Sturmey Archer spares distribution appears better.

Now I have a Shimano Nexus 8-speed hub gear commuter, but I need the gear range for the hills in my area. I have only opened it up twice to add a bit of oil to the grease and it is still running fine after 2.5 years, but if I lived in a non hilly area a 3 speed would be my first choice.

Alternatively if you prefer derailleurs then build yourself something with a single speed chainset up front with 'bash guards' inside and outside of the chainring and an 8 speed rear set-up: the distinction others are trying to make is that you are better off with a 'freehub' at the rear, where the sprockets come as a cassette which can be slid off the freewheeling device and replaced separately, rather than a 'freewheel' where the sprockets and freewheel device are built as one unit. Also the axle on quick release freewheel hubs can be a weak point due to the drive side bearing being positioned too far inboard.

Freehub cassettes are usually 8 speed plus, though there are 7 speed ones, freewheels are 5-7 speed only. I would go for 8 speed to get the best compromise of availability and durability, 9 speed and above systems do not last as well as everything (sprockets and chain) is made thinner to cram it in the same space and 7 speed uses the same dimensions as 8 speed but is less common. 9 speed rear derailleurs will shift an 8 speed set-up as they use the same cable pull, the indexing is governed by the gear shifter. With 8 speed you can have road or MTB STI type shiters, or MTB pod shifters, bar end shifters or even down tube shifters if you must. In general they are less expensive than 9+ speed shifters. Of course the cheapest shifter, derailleur, hub, frame, etc., is the one you already have... this leads to another question: what is wrong with the current bike and can you not repair/service and re-configure it to meet your idea of a simpler set-up?