If you only want to game on it, a monitor is a luxury meant for those with deep pockets. I have owned a TN panel and a IPS panel and the difference is enough only to justify if money isn't an issue at all. If you are on a budget, then anything over $250-400 on a monitor is a waste of money for a gaming rig. On a budget means if you spend less than $1500 a year on your PC.
You can buy a LED TV which are often pretty reasonably good as well and you get lots of good deals under $400-600. There is no reason to justify spending $1200+ on a monitor if money is a big issue.
And even if it is for work, then you can go with a 23 or 24" which is likely to be 1/3rd to 1/2 the size, 27" IPS is pure luxury. I can understand having 680 or 7970 as a necessity or a basic luxury but 27" IPS makes sense only if you have a budget of $4000+ on your PC with a budget to replace parts worth at least $1500-2000+ annually.
You can always go for smaller monitors, or large TN panels or very good quality big TVs which cost much less than a 30 IPS or even 27" IPS.