Q: What is your opinion of these equities which I have held in a well-diversified portfolio for a number of years?

Q: We have( for me) a quite large sum of money invested in managed products. Any new money is going into Canadian equities ( 30%) following your portfolios and a mix of ETF roughly
30% USA at 10% SPY, 10% VIG, 10%IWO
30% International currently VE
10% emerging currently VEE
( I know "where is your fixed income" you ask, my spouse has a federal government pension which I count as our fixed income)
To date these sums are relatively small. As I start to shift large sums from our managed products to my self managed portfolio ( following the above ratios) I am ok with the mix in the USA spread to 3 etfs run by 3 different companies. With the international and emerging I am a bit concerned about putting all that cash with one fund (and company). Is this concern silly or should I have some diversification within my ETF holdings ( both in terms of funds and companies). For example instead of having 30% of my holdings in VE I would split it 15% VE and 15% XEF. So I guess the short questions are:

1. What is the max an investor should have in any one ETF( %)
2. What is the max an investor should have with any one company ( $ or %)

Q: Hi 5i
I am completely new to the world of ETFs but, according to Portfolio Analytics (and I did know it was a good idea before being told, really I did) I need to add US and International exposure to my portfolio. I think the only reasonable way for me to do that given I don't/can't follow non-Canadian equity markets is through ETFs.
I would like to place 55K in US ETFs and 45K in International ETFs and this will, for now, comprise the entire non-Canadian portion of my portfolio.
I am not adverse to some above average risk and while I'd like income I'm more interested in growth.
In researching where to place this money I've concluded that I might not have the candle power necessary to make rational decisions about ETFs because of the distinct possibility of purchasing ETFs that hold the same or similar underlying equities from the same or similar geographies in the same or similar sectors (assuming I'm not just concentrating on discrete sectors). Left to my own devices I feel that I could very possibly purchase a little bundle of different ETFs that are all essentially but unintentionally quite similar.
My question is two-fold:
1. Is my concern about concentration valid or have I misinterpreted the lay of the land, and
2. Could you suggest 4 or 5 US ETFs and a similar # of International ETFs that I can consider and that won't have the type of overlap I'm worried about.
I realize this is a broad and general (and perhaps rambling) question - so please deduct as many credits as you think is warranted.
Thanks a lot!
Peter