The end of the road for my ABS diet?

I've been on the ABS diet since January 1, 2008. I have lost almost all of the fat that I wanted too loose. I've been very happy with the results.

I've been stuck at 202 lbs for weeks now. Nothing I do seems to make any difference. I can even eat bad for a day or two and not see any effect on my body.

My 6 pack is there. I can feel it. I can almost see it. I just have a little fat left to lose and I can't shake it. I've been almost there for weeks now. So to be this close and not make any progress is frustrating.

I've stuck to the workout routine very faithfully except for the weekend HIIT training time. Being a father of 3 I just can't carve out the consistent time to do it. To make up for it, I do HIIT on Tuesdays and Thurdsays for 30 minutes. 1 minute sprinting, 2 minutes walking, repeat.

I'm thinking I need to switch routines. I've read the Men's Health Power Lifting book and it looks like it's too much for my 40 year old body. Olympic style lifts are great for building strength. But I worry that it could cause a back injury. I think I'm genetically wired to be lean, not brawny. So the 6-pack look is achievable for someone like me.

Am I right on this?

I'm also not one to take supplements, other than protein shakes. Protein only that is, like Isopure. I have vision of Lyle Alzado dying from when I was a kid. So I'm very concerned about putting something in my body that medical science doesn't quite understand.

I'm searching for a new routine. Something to push my body to grow more muscle, lose this last bit of fat. And get that ripped look.

I'd love to hear what you think.