save up for 1200 and you will have a computer that will last a long time.
No you won't PCs become outdated quickly
not that fast, the difference between 700 and 1200 is huge.
My pc lasted years on a 1200 budget. Only in the last few years did I upgrade my GPU and I have no plans of investing more anytime soon as this is just fine.
I spent 1k on a pc.. would've lasted MUCH MUCH longer but I decided on a GPU upgrade. The 700 - 1000 difference can be HUGE if you budget things correctly.