I don't think any of us consider our XK's non manly. Have you seen the pictures of most of the member's on this site? We have people asking us all the time what we are driving cause they think they've never seen one. Just Lift it, put on some spacers and M/T tires and it's a heck of a sweet off road vehicle that works well as a daily driver. Go look in our photos and trails pictures. People with Wranglers are always dropping their jaws when they see some of the stuff we do with our so called non manly jeeps.
I second matt's reply, Go for it. Couldn't have a more comfortable off roader thats this capable.
If you have a choice go for the 5.7. The gas milage difference is nearly negligible for the extra power and better offroad system. I would have definitely done that had I known when I bought my 4.7.