I'm also 6'3" and my Softail Standard fits me OK-after I added forward mounts for the pegs and a Tallboy seat.
I have attempted to ride a Street Glide, and a Road Glide, both were very cramped for me. Highway pegs would be a must.

 

welcome to the forum
I have an '08 hertiage with mustache case guards and find that I can stretch out all I want (I'm 6'1'') main thing is to test drive before purchase if anything take a day trip south a couple of states and try a couple out over a weekend, every bike has its own feel even between years, I really don't like the feel of a '09 heritage but love the '08

 

I had no idea that there would be much of a difference between years. 10 or so years apart sure, but from year to year? Interesting.

 

Any ST with an X in second position, like FXST is a small front end and will not take footboards if that is a desire. I had an FXSTS Springer Softail and they have pegs like the Custom. Not my cup of tea for long rides. The Heritage or Fat Boy are FL models and have the footboard frames.

 

Actually not true, there are many options for floorboards on the FX models; a friend of mine rides a Duece with floorboards.

 

Love my Fattie, but I've also added used Harley saddlebags and plan to add a windshield from Windvest. I could have bought a different bike that included these, but these items are the ones that I chose and not what Harley installed. Personally I don't like the Harley windshields for my bike. The bags I got are from a Springer I think. Got them on here from a member. They bolted right up with no issues.

 

They are all great bikes, just choose the one right for you. There are a few good deals out there right now.

 

welcome to the forum and i agree with jason best to buy now