Help deciding to run HM or not (long)

I really don't have a strong itch to run a HM, but I need motivation for my training.

Background info:
In March of this year, I started exercising after a 12 year lazy-fest. By mid May I was up to a 6 mi. long run and started really getting into tri training which held my long run at 6 mi or less. I picked up cycling and swimming and have completed two sprint tris this year.

Now, I plan on being a "recreational" triathlete (job and two young kids take up plenty of time) with a couple of each sprint and oly tris for 2006. My 2-5 year goals being completing 2-4 tris per year of which would be mostly Oly and 1 HIM per year. Basically, I really like the crosstraining required to complete tris and the tris will keep me motivated to not fall back into the lazy-fest I found myself in when I started my real job.

I had also planned on upping my long run to 8 mi this offseason, but now am contemplating running a HM in the beginning of April.

I have found a HM plan from Hal Higdon that calls for 3 days running, 1 day cross, and 1 day run or cross. This would fit well into my current schedule, although I would only have 1 day of pure rest as opposed to two. I really don't know if I'm to the point where I should be concerned about running a HM or just continue with my general training.