Send mmcmdl that email...
I have 50+ toolholders, there's no such thing as a "complete" setup, but the styles you've selected are a good start.
I haven't dealt with latheinserts.com, so I can't tell what quality you'll receive. There are some remarkably good cheap inserts available, but also a lot of trash. I'd look for someone with experience with the particular insert(s) you're considering before pulling the trigger. A poor insert can be an exercise in frustration and a waste of even the small investment. That said, if you can find some decent cheap inserts (and, again, I'm not saying the ones you've selected are bad - I just don't know) then I think that's the right way to get started. Make your mistakes and bust your edges on the cheap stuff before shelling out $20+ per insert for the really good stuff. Along the way if you discover that a $1 insert works well for you, stick with it. The inserts I use range from less than a dollar to more than $30 a pop. I've found some really, really good cheap inserts (but also a lot of junk) and there are a few places (like CCMT and WNMG) where I just haven't found anything nearly as good as the brand-name stuff.
The insert holder should be given due consideration as well. The 'pro' stuff usually has a replaceable 'seat' (shim, whatsit, I don't recall the correct term) a lot of the cheaper stuff does not. Not necessarily a deal killer, but if you think you're going to ride it hard, you probably want the design with the 'seat'.
My advice would be to temper your initial order. Maybe get a RH CCMT holder and a few inserts and see how it works out for you. If your CCMT's are crumbling or easily chipped, or just don't perform, you can give up on anything else in that line performing well (CCMT are pretty tough compared to other shapes).
It's human nature to want to buy it all now, but it's wasted money if it's all garbage...
GsT