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Getting a not-too-$$ solution for a Sony A99 is a bit of a challenge because Olympus OM and Minolta MC/MD lenses, which can represent some great bang for the buck, are more difficult for A-mount. With that said there are still some great possibilities out there. Here would be my budget solution for A-mount
Basic set of primes:
Wide angle: C/Y mount Zeiss 28mm f/2.8 converted with Leitax -- your might also look at the new Voigtlander SLII 28mm f/2.8 which is due out shortly with a Leitax conversion.
Normalish: Rokkor 58mm f/1.2 with conversion discussed in this thread or Voigtlander 58mm f/1.4 with a Leitax conversion. If you prefer 50mm then the two C/Y 50's 1.4 and 1.7 are both very good and fairly inexpensive. I also like the Leica R 50 summicron especially with the Leica close-up lens for close focus work. If you prefer shorter than 50, the the Voigtlander 40 f/2 is a decent option as well.
For a fast short tele I would go with the Samyang 85mm f/1.4
If a slower short tele the C/Y 100 f/3.5 or the Nikon 105 f/2.5 are both excellent lenses. The C/Y is a fantastic landscape lens and the Nikon is quite wonderful for portraits. From what I have seem the Minolta A mount f/2 is just a tremendous lens and although not exactly cheap, I think it is an excellent value.
If you want ultra wide angle cheap, it gets harder. The Voigtlander 20 f/3.5 or one of the Nikon 20s are not too expensive, but they have their weaknesses. You can of course use the ZF 21 f/2.8, but it isn't cheap, but this dilemma is not unique to A-mount, but rather is an issue for every system.
For 200ish lenses the I think Nikon ED 180 f/2.8 is very good value for the money.
Basically, there are tons of options for Sony A-mount. Maybe not quite as many as Canon, but still lots of choice. Personally my main concern would be lack of tilt/shift options, but that is not a not-too-$$ issue.
I am seeing:
Anything Nikon mount (Nikkor, Zeiss ZF, Voigt) - easier conversion
Some Leicas - how are they to convert?
Some Contax - tricky conversion
What about other lenses?
Do Rokkors require conversion? For ex. 58/1.2?
What would a nice, not-too-$$$ alt setup for Sony A99 include?