In further response to your original question - I'd use the proceeeds from the sale to reduce your taxable burden as much as possible. For example, if you are not already maxing out your IRA/401(k) options, do so now, and use the proceeds from the sale to make up the difference in your paycheck.
If it were me, that's what I'd do... I take whatever tax-advantaged 'headroom space' I have left and fill that with the sale, then lump-sum the rest into my existing index funds.