Re: Landscaping advice
You don't say where you're going to get your 60 yards of fill from, but I would recommend everything below the 2' depth be cheap, clean fill. Everything above the 2' mark should be "top soil" which is typically a mix of compost, sand, and run of the mill dirt of questionable quality. To the top 12" I would add as much organic matter as possible in the way of fresh manure from a stable or similar local where it's clean poop with bedding materials. The introduction of this fresh organic matter will keep the top layer from compacting as well as provide vital nutrients for grass and vegetation that will most certainly be lacking from any "soil" product used in the backfill process. I would also suggest layering in the materials at 6" to 12" and compacting during the back fill process so as to minimize compaction after the fact.
I can't help with the construction of the retaining walls because I don't know your local or codes. From the sounds of it the yard will have full sun, so select grass and shrubs of a type that is conducive to your environmental needs (drought resistant, full sun, etc. ). Be sure to plan for irrigation, landscape lighting, and electrical power for everything from an outlet to a water feature or specimen lighting. If you think you'll be entertaining, you might want to account for speaker wiring and "temporary" power as well.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!