Oh, thanks for the tips, guys!
DH and I checked out tubs at Lowe's this weekend. Though I'm still thinking that the nifty Kohler tub I found (
http://www.us.kohler.com/onlinecatal...9&module=Baths) is great, DH says the 44" width is like a swimming pool and much too large.

We found one that is 5' by 32", and is 18" deep, which is nice. I actually climbed in it and it was pretty comfy. It's made by Sterling by Kohler, and it has a tub surround that comes in 3 pieces (way to go, Bamie!) that locks into the tub so we don't have to caulk. Just might be the way to go.
I love tiles, though, and we tiled our downstairs island, so we're old pros at it now.

I just wonder about cleaning the grout...all the tile baths I've known had nasty, nasty grout.

I know they make grout sealer...but how well does it work on white grout?

Your BIL's idea is great, Ellis! Is he using wallboard to create the shelves before he tiles? Or cement boards?
I know I'd love to see pictures...