I personally don't like LCDs but one of the important factors to look at is the response time, Looks like resonable priced good LCDS will be 8ms nowadays and moving lower. The lower the number the better but of course this cann't be you only determineing factor, some monitors with say a 12ms actually have been known to be better than 6ms because of how companies can measure the response ie 2 variations That I recall are
1) black to black pixel color cycle
and
2)gray to gray pixel color cycle
from what I have seen, your best thing is to read alot of users opinions and see for yourself as much as possible. I have seen a couple of LCD units that on paper are perfect and then in person I see "ghosting", and a kinda foggy look. That was 2 years ago and I gave up until I see the usual defaults for LCD's become 6 ms for around 150 or less and be really good known brands. I have even seen where Benq makes models that have built-in "overclocking" settings for fast visual intensive needs.