Note that the 18F24K20 is a 3.3V ONLY part, so the 18F2420 is likely to remain in the MicroCHIP product line. Another advantage is that the 18 series have larger stack.
Of course, from a purely cost/performance standpoint, a 28-pin PIC24FJ is several orders of magnitude above the 16/18 parts. For example, a PIC24FJ16GA002 has more RAM (4096 bytes), more peripherals and costs less than either the 16F876A or PIC18F2420.
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