First, you should probably get cue. Go back you your pool hall of choice. Bring calipers, a tape measure and a tip tool. Pick like 6 decent cues and bring them to your table. Trim the tips to a perfect nickel radius before you start. Shoot a game with each. Try to find a best one. When you do, measure:
Tip diameter
Shaft dia at 8", 16"
Butt diameter where you grip and it's distance from end of butt.
Balance point from end of butt
No house cue is perfect. List what you like and don't like about the best one. Also, for each measurement, decide is that about right, or should it be on direction or the other.
Try friends cues and do the same.
You should have a pretty good log of info to go to a cue store with, or contact one of our fine retailers on here with. I personally would pick a retailer off AZ.
Then, buy a cue for like $100-$300.
I think you said you wanted to get better. To get better, don't buy a cue. Buy Mosconi's book and find a good instructor in your area.
To tell someone how good you are, list your high run and the game.
Good luck in your search. IMO, cue pricing looks basically like this:
< $100 - Hard to find a playable cue.
$100 - $300 - good production cue
$300 - $600 - premium production cue with nice inlays, ld shaft, etc
$300 - $500 - basic plain Jane or sneaky custom cue
$600 - $900 - basic 4pt custom
>$1000 - fancy custom