I am new to this forum, but not new to this game. I concur with Zim & Chuck's position about "Trying and then buying". The best players typically play in the best of rooms, and with the best of cues. Also, typically these rooms attract the best amatuers, and then every room has their regular patrons. This obviously becomes an excellent place to start looking for a cue. As a matter of fact, on any given night you may find a cue that is right for you, and a player whose mood is right to sell this cue (that you like)? You may just get it for half its value.
My suggestion though (while shopping for a cue), is to know what your personal game requires. Knowing what style of player you are in relation to your stroke, such as a finesse player like Varner, or a power player like Strickland will help emensely.
Then, buy a high quality "SneakyPete" with two shafts, both shafts 13-13.5mm & with a straight taper (just about all cue manufacturers produce simple models from $100-350). Now, practice REGULARLY with just one of the shafts. You may discover that it is too stiff. If so, find a good local cue-maker and explain how the cue feels (reacts) currently, and how you would like it to feel in your game.
Down-sizing the shaft (turning) by .25 mm will dramatically change how the cue feels, but don't change the taper. Now practice REGULARLY with this new feel and if necessary have it turned again. (west coast rate for turning a shaft is 30.-50.)
In 1-2 months of REGULAR pracitice you will now have the feel you are looking for in a cue, or you have turned the shaft to far (or too small), then go back to the best of all diameters and have the other shaft turned to that specification.
If this fails, you might consider lessons to deterimine a stroke that is best for you; because at this point it is not the cue.
By the way, a good cuemaker should know what you need by watching you hit a few balls. This is also a good way to know if a cue-maker really knows the equipment that they make, and how it applies to different players.
I may have raised a couple of issues about a straight taper and a good cue maker. Any comments...? It's your game and money at stake...