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I am using LPC2132 (by NXP), in my project i need 4 uart, out of this 3 should be at 19,200 bps and one at 38,400bps. So i am planning to make 2 softrware uart with 19,200bps. Is there is any chance for performance issue. i am using 11.0592MHz crystal.
"It seems cheaper to look at a processor with enough UARTs built-in."
Quite possibly - search here: http://www.keil.com/dd/search_parm.asp
(a quick look shows that some of NXP's LPC parts have 4 UARTs...)