Oh, you have so many options! It's good to remember that just about any kiltmaker or retailer can offer you a tweed kilt suit, even if they don't specifically advertise it.

Here's one I enjoy wearing in Harris Tweed:


If you are interested specifically in Harris tweed, see my site here:
http://kilts.albanach.org/tweeds.html
(My Harris Tweed weaver is supposed to be sending me swatches of some new patterns she has produced this year, so I'll be uploading those to the site as soon as I get them).

Lochcarron has a range of Ettrick tweed and you can purchase kilt, suit, and/or vest from the Scottish Tartans Museum:
http://giftshop.scottishtartans.org/tweed.html

The museum also offers kilts, jackets, and vests from House of Edgar's "Glen Tilt" range, which though worsted wool (not tweed), is inspired by the patterns from Scottish estate tweeds, and so has that same "look."
http://giftshop.scottishtartans.org/glen_tilt.htm


And, of course, people have already mentioned Rocky's tweed kilt suits, which I think are very nice looking, and Steve at Freedom Kilts has chimed in.

If you have a favorite kilt maker where you are, I'd ask them what they might be able to provide, as well.

One thing I really like about the tweed kilt suit I have is the versitility. In addition to wearing the kilt/jacket/vest together as a "suit" I have also gotten quite a bit of wear out of each of them separately.

Go for it, you'll love it!
Matt