There are several options out there. I can only comment on those with which I have some experience.
Rans S-19. Sat in the first one just after first flight (so I didn't get to fly in it). VERY nicely done. Nice features. I believe, however (and this is based on conversation with Randy Schlitter at AirVenture 2009) that Rans would prefer to sell them more as completed aircraft. I have heard (w/only one builder's confirmation) that kit parts were slow in being shipped, since the parts were being used on completed craft.
Vans RV-12. Helped my neighbor / CFI build it, and have flown left seat. VERY nicely done; nice features like power ports, and a jack to port your intercom/comm content to a video/audio device for recording. Roomy. A bit slow; anything over 110 kts gets very noisy. Decent handling; optional autopilot is VERY nice for going anywhere, as you must continually fly it otherwise. I'd say it's on the expensive side; my neighbor's in for over $60K so far. Great plans, great support. He had several of us helping, and he was always waiting for Vans to start shipping the next kit part (he's s/n 75 or so, so he bought the wings before the tail kit was finalized, tail before the fuselage, etc.).
I'm building a Sonex with the AeroVee engine. I have purchased everything I need except for final little sundries etc., and I have about $33K in mine. Of course, I'm under the DFW Mode C veil, so I have to have a transponder, etc. You *can* build one for somewhere around $25-26K. Quite a bit of fabrication involved, but for me, that's enjoyable (regardless of some parts I screwed up!). Meets LSA, but will cruise faster at altitude. Aerobatic capable (but not prolonged inverted). GREAT builder support, both from the factory and online builder forums. I've never had an issue that someone else hasn't already provided a solution. A bit tight for two people; lots of people buy them with the center stick option and fly from the center of the seat. Two can fly somewhat comfortably if you don't mind having your arm being on the crossmember behind the pilot's back. Very straight-forward build sequence. Lots of folks say the plans are the best in the business. Very nice folks to work with as well. The performance claims on the website are spot-on with customer-built completions.
I budgeted 13 hrs / wk (3 during week, 10 on wkends), and at 2.5 years that would put me at about 1200 hrs, which is an average build time. Some have built in 700 or less hours - how, I'll never know. Some (the minority) have over 2000 hrs in theirs. I budgeted my time to allow for some trips each year (we travel out of state during college football season quite a bit, AirVenture, visiting son who's attending school out of state, etc.). Have to keep the wife happy. This month is the 2.5 year part for me, and I just have to hang the engine and finish wiring. At this point, I have 950 or so hrs in mine. 4Q2009/1Q2010 were killing me at work, so didn't get much build time in during that time, otherwise, I would have been well within my budget. (I'm not a slave to schedule, but in my real job I have to quantify things, so it's just natural I guess that I try to bound other things....)
I'm just saying, as have others, that if you approach it realistically, it can be very rewarding. The first assembly you make that looks like an airplane part has such a great deal of satisfaction and "wow" factor from the neighbors that it makes it all worthwhile. I may just build another one!