Personally, I would never own an uncalibrated display as my main display. I'm just too anal about accurate PQ. Adjusting by eye doesn't even come close to cutting it for me. Same goes for calibration using only the consumer calibration discs (i.e. Disney WOW, Avia, DVE, etc). The problem is, you can never adjust greyscale accurately without a meter - and greyscale is the most important adjustment to achieve an accurate picture. Color/Tint are "close enough" most of the time and you can get away with the blue filters that come with the calibration discs or just leave them at their defaults (i.e. "50"). I can't enjoy an unbalanced greyscale with inaccurate flesh tones however. But that's just me.
I have an this meter: http://www.amazon.com/X-Rite-EODIS3-i1Display-Pro/dp/B0055MBQOW
With the above meter, you can use the free HCFR software and the free AVS HD disc (you must download and burn to a dvd) to get an accurate greyscale calibration in a matter of minutes. There's a thread in the calibration sub-forum about the new HCFR branch that some AVS members have been working on and the software now supports the i1 Display Pro meter.
I use Calman software, but that costs another couple hundred bucks. HCFR is fine for a basic greyscale adjustment however - I've used it plenty of times in the past. There is a learning curve to doing software calibrations with a meter, but there are guides online to help with that.