The best advice I got when I dove in to 1/8, If you buy Junk, you buy Twice.
You are doing the right think really researching before buying and as most have stated the Losi RTR is a decent starting point.
IMO, I would strongly consider starting out with a buggy. Truggies will teach you have lot of bad driving habits that can be hard to break if you switch to buggy later on or add it to run both classes.
Don't know where you are from but Buggies will out number truggies at most tracks 3:1
Since you have previous RC experience, I would save up to get RACE quality equipment from the git go. I would also highly recommend getting a kit, a lot of valuable experience to be had by putting the whole vehicle together yourself.
Welcome back and trust me you'll be addicted again in no time regardless of what you end up buying!