Too much uncertainty for now.
For the S&P500 (the primary index please do not talk about the Dow - classic sign of someone who does not know how indices work), I've read that based on 2008 trends, the 2000 level could be tested. 2 more weeks of up and down, then some -5% falls to reach a bottom in the region of 2000-2200. At least vol should settle down with the quadruple witching (stock index futures, stock index options, stock options, and single stock futures expire simultaneously ) clearing open interest so people won't have to buy the rally and sell the lows so aggressively.
Most sellside banks don't provide index level estimates as it's largely irrelevant. Index levels are a combination of the constituent member fundamentals where earnings is typically the most important factor.
Plucking numbers out of thin air, I'd say 4300 for ASX200 and 2000 for S&P500.