have you found the threads regarding the xe-se/le front bumper swap? it's pretty involved because it's more than "bumper for bumper". a quicker solution maybe to have your chrome bumpers powdercoated black...and then painted if you feel the need. the chrome on my 04 bumper was good enough to make it out of the oven intact, so your 07 parts should survive too.
as for the grill, i have a silver xe grill to sell if you want to get it painted.
door handles can be bought online for pretty cheap. $4 each for the little handle pieces (escutcheons), a couple more bucks for the driver piece with the key hole, and about $13 each for the large handle piece.
http://www.courtesyparts.com/betasit...1376_1386.html