yeah, your system seems balance now, a bit higher cpu would help, but at about 2400/2600 the prices start to get alot higher, the 3200 is still usually no less than 100bucks....i'd go with what fade2green said, i'd just wait till you can get a better board also, probably a socket 775 system (the boards are generally cheaper with more items (like ddr2,pcie,etc), and many of the processors are affordable...if you sell your 2400 and 6600 you can afford it, there are boards that will allow you to keep your kingston ram also, but if you cant find one sell it (i'd say a decent 80 bucks , is it ddr400 or 333?) and get some cheap ddr2 ram... i'll try to find a good combo now
EDIT:
here are some boards and cpus that will handle AGP and your DDR memory (if the memory isnt ddr400 then you may want to upgrade it though)
#1
ECS 661FX-M7 (1.1) Socket T (LGA 775) SiS 661FX Micro ATX Intel Motherboard - Retail $40,$10 MIR
#2
PC CHIPS P13G+ (V1.0) Socket T (LGA 775) Intel 865G Micro ATX Intel Motherboard - Retail $43, combo deal with a PD 805 Smithfield, $109 for both ($23 off the cpu), if bought by Jan 31st
These boards have PCIE and DDR2 (for a full upgrade)
#3
JetWay P4M890DMP Socket T (LGA 775) VIA P4M890 Micro ATX Intel Motherboard - Retail
$51, you cant use your memory or video card with this board
#4
BIOSTAR P4M890-M7 PCI-E Socket T (LGA 775) VIA P4M890 Micro ATX Intel Motherboard - Retail $53, no vid or mem for this either, but has support for Core 2 Duo in the future for upgrading
If you wanted AMD here is a board....
Foxconn 761GXK8MB-RS Socket 939 SiS 761 GX Micro ATX AMD Motherboard - Retail $40,PCIE , but you can use your same RAM, combo with A64 3200+ for $91 (5bucks saved)
Here are some cpus-
Intel Pentium D 820 Smithfield 2.8GHz 2 x 1MB L2 Cache LGA 775 Processor - Retail $99 free ship
Intel Pentium 4 531 Prescott 3.0GHz 1MB L2 Cache LGA 775 Processor - Retail $85 free ship, not dualcore though\
And for the AMD board-
AMD Athlon 64 3500+ Venice 2.2GHz 512KB L2 Cache Socket 939 Processor - Retail $74 free ship
AMD Athlon 64 3700+ San Diego 2.2GHz 1MB L2 Cache Socket 939 Processor - Retail $88.50 free ship
There are some options for your system , the AMD board is pretty nice, but if you want to really upgrade and have room in the future i'd go with the 775s with PCIE and ddr2....
This is a decent card for your needs-(if u get a PCIE board)
ASUS EAX1300/TD/128M Radeon X1300 128MB 64-bit DDR PCI Express x16 Low Profile Video Card - Retail $50