I don't have a perfect answer for you (big surprise
) but some considerations might be helpful:
1) The current, extremely low interest rates (IR) mean that annuity contracts will be priced with very low payouts (in the context of being compared to previous higher interest rate levels not too long ago). Annuities are constructed based off the IR levels current at the month of purchase - low rates means lower payouts.
The last annuity rate index I came across in recent months was at 2.125% - thats REALLY bottom of the barrel. Given the presumption that QE will have to taper off (as repeatedly announced by the Fed) over the near/midterm period and consequently likely create rising IRs, its generally a no brainer to hold off purchasing any annuity contract(s) until we see what the end of QE does to IR levels.
2) My comments in 1) above are not based on opinion, just derived from current factual information. What follows IS my opinion, just that, no promises or warranties
:
Whether you should alternatively dump the assumed $300K into your 401K is a judgement call. Personally, I wouldn't, based on the presumption that the end of QE will create some as yet unknown level of froth in the markets and I wouldn't want to risk funds I had designated for secure income streams. That is, as noted - JMO.
3) Whether annuities make sense to you is obviously a personal decision. IMO, they can possibly be useful in some limited circumstances but I'm not a huge fan of them. Most especially with anything other than a very plain vanilla, fixed variety with inflation adjustment features from a rock solid company.
I'm much more fond of simply using personally calculated, item specific inflation adjusted* cash stashes to cover BLEs (basic living expense items) for multiple years. It simply removes one from having to consider market risk, annuity company risk and related considerations.
* I calculate a rolling five year price increase factor for each of my major BLEs (RE taxes, food, utilities, insurances, etc.) and use it to establish a cash stash to cover those anticipated expenses for X number of years. Its certainly not perfect but is much more accurate than using a unitary CPI measurement which doesn't have much relevancy to my actual experienced costs.
My BLE expense increases have been increasing at way more than double the official CPI measurements in most cases since I retired in 2007. (Actually, they've been doing that for many years. The CPI is useful for macro economic analysis but not of much use for real world personal expenses projections.)
The foregoing is probably a bit obtuse - think of it this way: my RE taxes are X, in the previous five years they have risen at an annually compounded rate of Y. I want to set aside a cash amount that will cover the annual RE tax costs for Z number of years. Simple math gives me a useable value to designate a cash chunk to cover that expense.
Is my approach a plan that maximizes my future income streams? Nope. Does it allow me to ignore the market/company/etc. risk factors? Yep. Its based on my intent to minimize the attention to I need to pay to managing retirement resources going forward.
My non-BLE "fun money" is in the market. If things go well, I've more to spend on travel, etc. as well as move profits into my BLE cash accounts and extend the number of years where I don't care what the markets are doing. If things don't go well, I've no need to care about covering our basic living costs. It works for me
.
Hope the foregoing has been of some use to you.
PS - I'd rather be Makawao myself, but its just too pricey for me. The Maui burger at the Stopwatch was probably the best dead cow I've ever eaten.