Probably the best option, if you're doing a full renovation, is an in-wall toilet system. These have a cistern that fits in between the studs in the wall and only the flush buttons and pan are visible. You also have the choice of back-to-wall or wall hung pans (clean right under the toilet).This is the best space saver as the space the cistern would normally take is eliminated from the room (have a look at our In-Wall Toilet System Builder to see what might suit).
However, if an in-wall cistern is not an option, there are a number of wall facing toilet suites with short projection (wall to front). Just have a look at the specs.
Before you start looking, take a few minutes to measure your bathroom and work through the "How to Plan Your Bathroom" article in our Tips, Tricks and Traps section. This will help you ensure it's not impossible to get off the toilet or that you don't hit your head on a vanity or towel rail when getting up. Also have a look through "More info on toilets" in Product Advice for tech stuff about water entry and traps etc.