in terms of performance and wattage per mhz, superior. its a core 2 architecture afterall.
does your old mobo support the new cpu? full specs please.
wait a little bit on the gpu purchase...give or take a week or two.
Budget CPU for Enthusiasts: Intel Celeron E3300 Processor Review (page 2) - X-bit labs Budget CPU for Enthusiasts: Intel Celeron E3300 Processor Review (page 5) - X-bit labs Budget CPU for Enthusiasts: Intel Celeron E3300 Processor Review (page 8) - X-bit labs
do get the 3300, its the same, a little bit slower at stock but overclocks just as good.
it ll do easy 3.2 on stock, higher if you dont mind the stock fan noise.
edit :
same if you dont mind 1 meg of cache. for a value cpu it doesnt matter much.