In regards to the tangent this thread has taken about appreciation vs. saving, don't forget the tax implications...
If you are making enough to afford to save 2-3K per month then you're probably making
well into six figures and fall into an extremely high tax bracket. Last time I checked there weren't a whole lot of tax deductions for renters. Saving that 2-3K while in the six figures and paying the high cost of living here in Irvine ($1600 per month for a 1-bedroom) means you will be sacrificing many of the things that your co-workers enjoy like eating out, disregarding produce prices, not worrying about leaving the lights on, realizing that your $5 blockbuster rental, $4.50 golden spoon ice cream and your $3.50 crapachino is a rip off, etc.
The government discourages saving through income for a down payment and encourages the building of wealth through appreciation a la 1031 exchange.
1031 Exchange: IRC section 121 states that if a principal residence is owned and occupied by the taxpayer for two out of the last five years then the first $250K of gain ($500K for married couple) is income tax excluded.
So if you're making money as a renter and not spending it (no write offs) the government deserves a big piece right? Never mind the fact that you're eating beans to save that 2-3K while the homeowner next door with the exact same salary goes to is eating filet mignot every weekend. But less I diverge further, our tax system is set up on one's ability to pay, not to pay what is “fair” (everyone disagrees what “fair” is anyways).
Alas! I do not intend to drive this thread any further from its course and I diverge to my most recent my point regarding saving a down payment. One is presented with the classic chicken-in-the-egg scenario: you can't build wealth through real estate appreciation until you buckle down and save your down payment.
If your tax bracket is 40% you can only reap 60% of your income, and since many of your living expenses (rent, insurance, etc) are fixed-period costs (such as once per month), your ability to save up for your down payment is severely limited. Although you can save more if you are making more money and have the same fixed costs as someone who is making less money, the proportion of income you save decreases with your higher tax bracket. Its like tractor pulling.
However, the $250,000 you gained on your house through appreciation is a 100% gain since you’re not taxed on it at all. The more your property appreciates the more you gain, so long as it is under the 1031 exchange limits.
The real question here is, how much appreciation has the move-up market that you will be buying into seen since the purchase date of your current home? If you desire to have your new mortgage payment the same as your current one and the move-up market has seen more appreciation than your market, then you don’t get as good of a deal and in some instances you may choose to stay put.