Fanatec are releasing a more budget friendly direct drive system soon, however pedals are the best place to upgrade. A good load cell brake such as the Fanatec offerings are a huge improvement for consistency. But you can just mod the G29 pedals with a spring swap. I did in on my G27 which made a big difference to braking feel.
Don't be under any illustration on being faster with new gear, it can help obviously but it's more about the experience and authentic feeling. A lot of "Aliens" in the sim world run cheap gear but if you're after upgrading for quality and feel then Fanatec isn't a bad place to start over the Logitech gear.