From the value investing camp: if a stock I've bought goes down X, I buy more! Why wouldn't I buy something when it's gone on sale--even more?
I would recommend against transaction costs, because that can cause strong incentive-caused biases for the manager to "trade" your account.
Make sure that the funds you own have beaten and/or matched the market for the last little while. If they are lagging, sell them and just buy some index funds.
I would recommend picking up a good book on personal finance (I believe the For Dummies series and hte Complete Idiot's Guide to has copies of it) to help you to understand your options a bit more.
Good luck and HTH!
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