Me too (64, 6'2"). I find there's plenty of room on the NF. Dave -my longest day rides on the NF have been in the 400 - 500 mile range which, at NF road speeds means lots of wear on the backside, even if the bike seems unflustered.
I just checked - in the 2 years I've owned it, I've ridden it 11,000 kms (just shy of 7000 miles), so not too much really, although I can use the excuse that I do have 3 other bikes...... and I use the Eldo mainly for long rides. It's different here though - it's 500 miles to just about anywhere, and when you get there (as Jake will attest), there's not much of a destination.
I hope the Spada works out well for you. Just keep the lowers safe so you can replace them if you decide to sell.
Nick