Since you live in Canada ask yourself how often you plan on driving it.
I had the same dilema about a month ago before I bought.
Here's what switched me: If you drive often, you'll have the hardtop on more than off an you won't even notice the one thing that the RT has (benefit wise) over the GTS. I'd enumerate them but I did that once and it's about a page of text.
In any event, I'm 6'6" (so I win
) but here's what I found:
w/o seat drop:
-knees don't fit w/o pain
-RT w/hard top doesn't allow enough headroom (about 3" short)
-GTS allows about 3" to spare
w/ seat drop (2"):
-knees barely fit, but it's very driveable and comfortable in it's own way
-RT - don't know, I might fit.
-GTS I have about 5"-6" of headroom.
Don't drop it 2" if you want to put an amp under the seat though (I found out the hard way). Use the 1" instead, if you even need one, SHORTY!