lol, what do you mean by AMD is "enough"..... I personally would never build with anything else than AMD, but that is a personal preference.
But seriously, the only thing that you would need alot of power there for is gaming. So it really hinges on what games you would want to play. The 2400+ isn't really in the same league as a P4 2.4c with 800FSB. You'd be looking in more of the 2800+ catagory which is still quite a bit cheaper than a P4 2.4c(or e).
If you're looking for plenty of power in the P4 2.8 price range I'd suggest going with this
AMD Athlon 64 3000+, 512KB L2 Cache 64-bit Processor - Retail
http://www.newegg.com/app/viewproduc...103-486&DEPA=0
EPoX "EP-8KDA3J" nForce3-250Gb Chipset Motherboard for AMD Socket 754 CPU -RETAIL
http://www.newegg.com/app/ViewProduc...123-219&depa=0
That will give you power equal to or greater than a P4 2.8.
If you don't think you need that much power you can get a nice Athlon 2500+ and mobo combo for under $180 (which is the price of the CPUs only mentioned above).
EPoX "EP-8RDA3+" nForce2 Ultra 400 Chipset Motherboard for AMD Socket A CPU -RETAIL
http://www.newegg.com/app/ViewProduc...123-198&depa=0
AMD Athlon XP 2500+ "Barton", 333 FSB, 512K Cache Processor - Retail
http://www.newegg.com/app/ViewProduc...103-379&depa=0
(I'm just giving you the AMD side of it, I'm sure plenty more out there will have suggestions for Intel)