If you're looking to get a HOTAS, I would find a few you may be interested in and vary the budget with your selection, including more than and less than what you think you should spend. Then, take those choices, go on a place like Amazon (I primarily use Amazon) and search each item. You will get a good idea of what they may cost there, on other websites, and (more importantly) the reviews. The reviews have always been very genuine on there, and will give you a good idea as to what is worth the buy and what is not. Usually anything above 4 stars is good, 3.5 is pushing the quality. Ultimately, it comes down to what you want.
I would start with a budget controller, don't go spending at the TOP OF YOUR BUDGET right away. Spend a little now, see how it feels. Hell, it may just be a phase and you may end up dipping out on using the HOTAS over time (so you saved money). Alternatively, you'll love it, and know what to expect when looking for something higher in quality. You can then sell your current one (so long as you take care of it) to someone you know who may be looking to do the same (like I did) and buy your new "top notch" one when you're ready.
At the time I purchased my stuff, I believe I made my first choice item at $200 or so; the X52 Pro Logitech Hotas. It was a good buy for what it was worth, decent quality, but the reviews were kinda crappy. However, I took a leap of faith and went for it. It was okay, some software issues, and there was some nit-picky stuff going on with the joystick, nothing major. After a while of using this, I decided upon upgrading to the Thrustmaster Warthog + the Thrustmaster TFRP Rudder. They're working out great for me now.