Research and scale questions

As mentioned in my last post I've started thinking about a new project. To this end I went through my book collection and also picked some up through my excellent local library service. Here they are:

This week my copy of the Flames of War Tour of Duty supplement arrived. I'm very happy with it, it's very good background info for whatever rules and whatever figures I end up using. It was a bit of a steal for £8.99 off eBay.

I still haven't completely decided what scale to collect 'Nam in. I have an Indo-China collection with 40-50 20mm Liberation Minis Viet-Minh figures, a few buildings, some palm trees and other assorted terrain bits that would all do very well. That leaves me to add in some AK-47, RPG and RPD armed troops and that would almost be one side complete. 

For the USA and or ANZACs I'd have to start from scratch. Dependant on the size of force and how much armour I wanted this could be costly.

Or the alternative is to go with 10mm using Pendraken and Timecast. All excellent stuff. Decisions, decisions but I've made a start and will look at properly costing out what size force I want to collect before I make any purchases.