ok thats funny because a part of the use of cnc is also doing mold. See picture attached thats what i do.
so i think any cad will do the job rhino also ok. I think your job can be done (depending if you have time constrains ) by any 3d software i do/did use cut3d, deskproto 5 pro because of the lathe i bought now bobcad but this may be an overkill for your tasks.
Have a look at the machine (i use the kit for doing pcb´s and have a toolchanger in it) USOVO.de - Proxxon MF70 CNC 2008 MF70CNC2008
so 800 Euros not that bad. But for my molds i use an Heiz 400T look at the machine aroud 2400 Euros. Sufficient for alu and all sorts of wood and plastic. 3D CNC Fräse 400er Serie -. When your mold should be done i alu i think the heiz is fine. I now have to build something in steel so i did buy an local turning lathe with an miller head. Here the ictures http://www.klippfeld.at/frame_de/dre...aschine=K-10B# so i think
it makes sense when you mill on your own ,..
but which machine and software combination is hard to say. i recommend an list what is important for you ,.. and weight it in verry important till nice to have then make the machines compareable in an kind of excel and then decide. Thats the way i did it by the heiz and the klippfeld. ,.. i see i cant post pictures i will do that in my area cu thomas