I was wonder what a good card for my pc i know the 3850 is the best AGP card but i dont want to spend that much and my system will bottleneck it.
I would like to spend around 75 and will use newegg or ebay.
my current pc
MB: Soyo Dragon P4X400-8235
Intel Celeron 2.7ghz
1792 MB RAM
NVIDIA GeForce FX 5200
500 watt Antec psu
I use a 15 inch synaps flat screen
That's pretty slow, especially if not even a Celeron D, but the older version that only has 128k of cache. The 3850 really needs a faster CPU to shine, so for you there is no point in getting anything faster than a 2600XT if you're looking at new cards. If you're gonna look for old cards on ebay then go for an X1900 series or Geforce 7900 series AGP card.
I recommend you save up money and do a new build. A cheap AMD CPU + decent AMD motherboard (with PCIe x16 and IGP)+ DDR2 RAM will cost ~$120-150. Then upgrade graphics later. You will essentially be wasting that $75 as AGP is dead. Better save up money for a new build.