I am curious to know why you think you need a better body than the XTi?
As far as the photos go, I’ve seen a few wedding photos, the location looks very nice, and you do have some neat ideas that I can see in some of the shots. “Hang Your Cross” made a good observation whether he knew it or not; since its a wedding everyone is supposed to be happy…you captured something different there, shes happy and he seems to be miserable lol. For wedding shots, I would make sure everyone is happy and cheerful in all of the shots, unless you are trying to convey a different point or underlying feelings that the groom has.
Un-level horizons. That is one of my bigger pet peeves in the photo world. Make sure glasses on the table, buildings, and tables themselves aren’t defying laws of gravity in a shot. Most of which you have done :thumbup
It looks like it was early afternoon with some nice bright sunlight which isnt always easy to shoot in either. My friendly suggestion for the shots you posted is to work on your compositions. Ask yourself, would the shot look better if someone could see the whole glass on the table, as opposed to having the top or bottom of it cut off in the shot? The third shot you posted: the mirror on the table being cut off on the bottom, the dark background behind the vase bugs me, and your subject is centered.
Weddings are tricky, that is why I have zero interest in photographing them and if someone asks me I tell them a ridiculous price lol. This guy: www.davidjay.com/ charges a starting price of $12,000 a wedding and only does a few a year, he does some great work.