I'm a 2013 max-BTO MBA user, utilizing both OSX and Windows.
I'll strongly advice to get the 8GB RAM for ur setup as Windows can be very memory hogging. You know u can't upgrade anything else later on the hardware, right?
I'm using 8GB RAM MBA, and bootcamp on Windows isn't a pleasure to use at all. It still lags, and opening a simple Excel file is really taking up some time, especially on the first launch upon reboot. The whole experience with bootcamp isn't pleasant at all.
Well, i'm using bootcamp due to some uncertainty on settings on my Parallel Desktop(PD) earlier, and now i'm back to using Windows from PD again.
My RAM usage will always exceed 6GB after launched Windows, even when i'm not doing anything or having any open apps in Windows from PD9. It spikes up to max when i'm having running apps on it. Although showing max RAM utilized, MBA is still providing me a very smooth experience, to be honest.
My advice here, top a lil bit for the 8GB RAM, so u won't regret it later, unless u got a deep pocket that allow you to upgrade a new one later.
Arghh! Your advice is like a week too late, I've already jumped the gun and got a 4GB MBA. Havent installed Windows yet coz been busy with work at the moment. If I do install Windows using Bootcamp and it lags like you say it does, I can just remove it and undo the Bootcamp partition right?