The top end A64 X2s aren't really price-performance competitive with Core 2 Duos. The 3800 has the advantage of basically going against Pentium Ds, and so is probably the pick in its price range, and 4200 vs E6300 is probably the most competitive AMD gets vs. Core 2 Duo.
Basically, here's how the dual core desktop x86 chips break down (ignoring discontinued chips, like the 1 MB X 2 cache Athlon 64 X2s, and a lot of Pentium Ds)
(prices from newegg.com; cross-checked at TigerDirect; in US dollars; as of 9/9/2006)
~$100 Pentium D 805; cheapest dual core available, and overclocks well, but not all that fast at stock
~$125 Pentium D 915; see the 805, except that it runs cooler, but due to a higher FSB, isn't as overclockable
~$150 Pentium D 945, Athlon 64 X2 3800; Go AMD at this price point, unless you're planning on getting a Core 2 Duo capable motherboard with a P-D 945 and upgrading the CPU later
~$200 Athlon 64 X2 4200, Core 2 Duo E6300; generally rule of thumb is to go Core 2 Duo if you can afford to, though the performance case becomes stronger at higher speed grades
~$250 Athlon 64 X2 4600, Core 2 Duo E6400; the 6400 costs less and performs better
~$350 Core 2 Duo E6600; easily the best price-performcance CPU out there, but $350 is a lot to spend on a CPU; gamers would get more by spending an extra $100 on their video card than on their CPU
~$500 Core 2 Duo E6700; not as good of a value as the 6600, but it is faster; if you need the fastest non-crazy desktop CPU, this is what you get
~$600 Athlon 64 X2 5000; terrible value, stay away (AMD's list price is somewhat lower, but this is what they're actually selling for), the E6600 is always faster, and the E6400 sometimes is
~$800 Athlon 64 FX-62; fastest AMD desktop CPU, but also a bad value since the E6700 is always faster, and the E6600 usually is (again, AMD's list price is somewhat lower, but this is what they're actually selling for)
~$1000 Core 2 Extreme X6800; fastest desktop CPU, period, and has an unlocked multiplier, so it overclocks well; for overclockers with money to burn
Basically, here's how the dual core desktop x86 chips break down (ignoring discontinued chips, like the 1 MB X 2 cache Athlon 64 X2s, and a lot of Pentium Ds)
(prices from newegg.com; cross-checked at TigerDirect; in US dollars; as of 9/9/2006)
~$100 Pentium D 805; cheapest dual core available, and overclocks well, but not all that fast at stock
~$125 Pentium D 915; see the 805, except that it runs cooler, but due to a higher FSB, isn't as overclockable
~$150 Pentium D 945, Athlon 64 X2 3800; Go AMD at this price point, unless you're planning on getting a Core 2 Duo capable motherboard with a P-D 945 and upgrading the CPU later
~$200 Athlon 64 X2 4200, Core 2 Duo E6300; generally rule of thumb is to go Core 2 Duo if you can afford to, though the performance case becomes stronger at higher speed grades
~$250 Athlon 64 X2 4600, Core 2 Duo E6400; the 6400 costs less and performs better
~$350 Core 2 Duo E6600; easily the best price-performcance CPU out there, but $350 is a lot to spend on a CPU; gamers would get more by spending an extra $100 on their video card than on their CPU
~$500 Core 2 Duo E6700; not as good of a value as the 6600, but it is faster; if you need the fastest non-crazy desktop CPU, this is what you get
~$600 Athlon 64 X2 5000; terrible value, stay away (AMD's list price is somewhat lower, but this is what they're actually selling for), the E6600 is always faster, and the E6400 sometimes is
~$800 Athlon 64 FX-62; fastest AMD desktop CPU, but also a bad value since the E6700 is always faster, and the E6600 usually is (again, AMD's list price is somewhat lower, but this is what they're actually selling for)
~$1000 Core 2 Extreme X6800; fastest desktop CPU, period, and has an unlocked multiplier, so it overclocks well; for overclockers with money to burn
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