Every other day it seems, some price-conscious newbie asks about "a good wheel"
I've been using my G25 for years - and although I would like to take a step-up from it, it really took me a loooong time to actually hit it's limits.
G27 is practically the same wheel with a few improvements: less noisy/notchy gears inside (or so they say), mod-friendly pedal-faces, more buttons on the wheel.
What it doesn't offer is a load-cell brake. But that can be modded later on, albeit at a price. As a whole package, you cannot go wrong with a stock G27.
If you want an alternative in the same price range, take a look at the Fanatec "CSR" and "911 GT3" "911 GT2"-wheel. Fanatec will leave you the choice of what kind of pedal-set and/or shifter to get in addition to the bare wheel. They do offer better/ more expensive stuff as well as cheaper options.
Virtually all affordable stuff is made in cheap-labour asian countries and then shipped over here. Logitech might be found on store shelves more often than Fanatec.
A notch above the aforementioned wheels would be the Thrustmaster "T500RS" albeit at a much higher price-point and still without shifter & load-cell brake. Fanatec has the "CSR-elite" and "Clubsport Wheel" to match it's price and level of performance.
All in all: you get what you pay for. G27 is a solid choice for potentially years of trouble-free use. Just remember to treat it with respect, as some aspects of it's construction are more toy-spec than hard-core-tough. Same story for every relevant alternative.