I've got a set of the Meinl mid-line bongos like these
http://www.musiciansfriend.com/srs7...195210851/g=home/search/detail/base_id/100582
I think they sound great- pretty comparable to the Matadors. I would definitly avoid the low lines of LP (used to be called CP now called Aspire), Headliners (Meinls low end), or Toca (Toca's upper end stuff is good, but it's all called Toca, cheap or expensive).
For me I really love my Meinl Floatune Congas (more so than Matadors, or upper end Toca I've played), and the Bongos were, as good as any for the money. Most of what you are getting for more money than that is exotic wood, special finishes, and limited editions. Like these:
http://www.meinl.de/percussions/perc_2_8_14.html
I would reccommend at least playing one set of traditional hoop rims, and one with the newer comfort style rims (from any manufacturer) to see which you like better. I think the traditional rims almost always sound better, but they can be harder on your hands.
If you really want the best, and money is no object, I'd say find a drum specialty shop, and you'll probably have to pick a brand that you think you can trust, and special order them, because most dealers don't have the top lines in stock, just the low and middle.