Sumpter, I think the misconception is on your part. TT scale (1:120), is 72.5% the size of HO. N scale (1:160) is nearly half (54.4% ) the size of HO. So your 8' train is actually a scale 1/4 mile long. I think now the big deciding issues are likely a) sound - you can get sound in N, but from what I've heard it's a little thin and tinny; and b) availability - while there's more available in N, especially steam these days, there's still less choice (locos, rolling stock, structures, details) in N than in HO.