For the past few years, I've been recommending the Nikon D750 to enthusiasts and semi-professionals needing a reliable DSLR to grow in to – probably more than any other ILC on the market. It was even my Gear of the Year in 2015 for its excellent feature set to price ratio.
Though it debuted in late 2014, the D750 remains a relevant and reliable workhorse years later. 24MP of resolution on a full frame sensor is a sweet spot for a lot of shooters, and the D750 still offers competitive dynamic range and excellent high ISO performance. It also has terrific autofocus, with Nikon's reliable 3D Tracking.
And as far as full frame DSLRs go, it's among the lightest ever made. But it's also a camera we know will likely stand the test of time thanks to aggressive weather-sealing and sturdy construction. In short, the D750 has proven to be among the most future-proof full frame DSLRs in recent memory. Even today it's still priced aggressively enough – with technology that is relevant – to warrant my recommendation, not to mention the recommendation of the DPReview staff in our Best Camera Under $2000 roundup.