SPY is listed in the U.S and you'll have to convert to U.S dollars. VFV is vanguards SnP 500 canadian listed ETF, volume is subpar but it tracks it. ZSP is BMO's listed ETF for SnP 500. XSP is iShares version.
HSU is a 2x leveraged one listed on the TSX offered by Horizon.
Plenty of options. Like I said the charts are gappy due to lack of volume but for a longer term hold I wouldn't say you need to worry about liquidity, just costs and transaction fees, and transferring currencies aren't fun either. Theirs also lots of currency hedged ETF's that track the SnP 500 but I remember reading an article that showed the returns of both compared and the cost of the Hedging by the ETF really ate away any of the benefit.
Long term holds, sometimes for years, often require a rare but very quick exit. The mutual funds are interesting because you get only one closing price, but hopefully it is a professionally executed price which you can assume was the best they could get. No opinion, just something to think about.