To get the same contrast ratio and response time as plasma you'd have to buy an LCD TV with at least a 480Hz refresh rate and LED BACKlit with at least 160-200+ zones for local dimming. With that being said, I would rather have that LCD than plasma. Fortunately that describes the upper end of the 2010 LCD sets from everyone and I should be able to get a 55" set for under $3000 with 3D to boot.
ironically this is about as backwards as it gets. LCD displays have been making significantly larger strides than plasma for about 4 years now. To the point that the best LCD displays are FINALLY beginning to look better than the best plasma displays (after only 9ish years or so)Get a Plasma. LCD is old school!