I need a great, unique wedding reading

Roy Croft … not unique, but wonderful none the less

I love you
Not only for what you are
But for what I am
When I am with you.

http://thinkexist.com/quotation/i-love-you-not-only-for-what-you-are-but-for-what/1602010.html

Also Anne Bradstreet

If ever two were one, then surely we.
If ever man were loved by wife, then thee;
If ever wife was happy in a man,
Compare with me, ye women, if you can.

http://library.thinkquest.org/CR0215687/Anne%20Bradstreet.htm

Well, if you’re feeling that ‘husband’ and ‘wife’ are kind of narrow baggage-laden definitions of how two people can be together, here’s Jonathan Richman on it:

When I say ‘wife’
it’s cause I can’t find another word
for the way we be
but ‘wife’ sounds like you’re mortgaged
‘wife’ sounds like laundry

When I say ‘wife’
it’s cause if you said ‘lover’ every day
you’re gonna begin to gag

[Full lyrics at http://homepage.mac.com/ramonrempel/JoJo/songs/w/whenisaywife.html]

Or, similarly but more seriously,
“Why Get Married At All” by Marge Piercy from her collection “My Mother’s Body”.
Can’t find it on line, unfortunately, but similar.