Not being a pill, but "limited budget" is subjective to each person I think. For me tho, I bought mesh clothes first of course, then hair (I get eye twitchy over flexi hair clipping into bodies), then slink feet for the shoes, slink hands (just discovered I've had a bento update waiting on me a long time there) and a loud mouth set of lips. I was gifted my catya bento head- I doubt I'd have ever bought it for myself due to price- but I love it. This has been a slow process over probably five years to go completely mesh- even down to my eyeballs and ears.
With so many decent freebies available, and blogged about- if you can take the time to look for them, you could possibly put together a very nice avi including an AO for about 1KL if you caught sales & gifts... But for me, I think the most important part of my avi for me is my head. Even tho I said I'd not have spent the money to get it, it is my fave part I just don't foresee a situation where someone would buy a bento head and then go about getting freebies to put the rest of the avi together- unless its for an alt- which I have made alts but never feel like "me" and abandon within days....