Although the ultimate DC fast-charge standard is still up in the air, the J1772 standard is fairly well-settled. Any J1772-compliant EVSE will likely charge any EV for the foreseeable future. Even the Tesla will charge from it with a small adapter.
You'll get different opinions on how many amps to provide. I tend to think that anything over 30 amps is overkill for a home station. Truthfully, I'm happy enough with 16 amps, which was the most a 2012 LEAF could charge at and the largest circuit we could install due to load considerations. If I get a 2015 LEAF (likely), I will still use the 16A EVSE.
People tend to think in terms of charge-time from 0% to 100%. And they worry that a larger pack will "take too long to charge". In my view the situation is somewhat reversed. As pack size increases, the average percent-range of your charging will tend to decrease. For example, adding 70 miles of range in LEAF may require a full charge. Adding 70 miles to a Tesla may only require charging 25% of the pack.
A better way to interpret your charging needs is miles of range per hour of charging. A 30A charge adds about 25 miles of range per hour to LEAF. Somewhat less for a larger heavier car like a Tesla. That's 100 miles in 4 hours, 200 miles in 8 hours, etc...
Another consideration to me is the "good neighbor" aspect. A high-amperage charger puts a heavy load on the local infrastructure such as the local transformer you may be sharing with your neighbors. Even 30 amps at 240 volts is as much as some households use in their entirety at peak load. As EVs become more prevalent, higher charge rates may prove to be too high if you have multiple neighbors on the same transformer all trying to charge at high rates at the same time. Depending on where you live, this may not happen for some time. But since we're talking "future-proofing" here...
Keep in mind that household load calculations should be done to determine how much amperage can be allocated to the new circuit without exceeding the capacity of the panel or even the electrical service line itself.