Hi Funked,
I think you might be at a crossroads here...
I would upgrade to a PIII CPU Flipchip, Via motherboard (preferably ASUS) and 128 mb 133mhz ram all at once, even if it means waiting a while. Then your 770 Ultra will be the bottleneck, but it will be much faster, so it will do you for a while longer.
This will give you a continuing upgrade path, ie > overclock or > Cpu > ram > video card, whereas with a BX board, you would just about be at the end of the line.
And you won't need any Slotket, which can be a problem.