from my own experience of running the 9800GT & 125w CPU on a 18a single rail PSU, he won't be "border lining". In fact, i find your experience level with PSU information...lacking of knowledge.
I speak only of my own experiences. I do not work for a computer store so what you say is well within reason.
Don't let me confuse us. I'm still gearing for the future so looking at the past I could have my wires crossed.
If it ain't needing over 36a I probably have no business posting about it.
I had to go through the whole "Why won't my 8800GT run on my Bestec 300 watt PSU" question about 3 years ago, so I'd say I have a little knowledge on it.