I've been researching and preparing to invest a fairly large sum of money for several weeks now, and have recently become stuck on the question of whether or not to slice and dice in a taxable account with regards to tax implications. I'm drawn to the idea of trying to tilt toward value and small cap based on the writings of William Bernstein. I realize this has probably been discussed to death, but I haven't been able to find peace of mind with a decision in any of the information I've previously found. Without going into too much detail again, this account will be treated as a stand-alone portfolio. I intend to hold these investments for 25 years or more.
The portfolio I have come up with is:
30% Vanguard Total Stock
10% Vanguard Large Cap Value
10% Vanguard Small Cap Value
25% Vanguard Total International
25% Vanguard Total Bond
Recently I have been having doubts about including the less tax efficient funds, simply because I don't feel I fully understand the tax implications.
Many bogleheads seem to be vehemently anti tax-inefficient in taxable under any circumstances. My understanding though is that I should still be able to earn a better after-tax yield on these funds so long as the value funds do in fact outperform the total market over the long haul, which seems likely, historically speaking. The only other considerations I see are the potential for tracking error and increased risk, and the additional effort for rebalancing and taxes. If I'm not mistaken, shouldn't these additional funds actually serve as a means of increasing returns when rebalancing since there are additional funds to become overweighted and sold at a profit? Also, although small caps in and of themselves tend to be more volatile, couldn't they reduce overall portfolio volatility since they don't always track the broader market to the tee?
I may be way off base with some of these observations. I'm far from an investing expert. Any and all thoughts and suggestions are welcome.

