> There are zero reasons to limit yourself to 1GB of RAM. By paying $20 instead of $5 you can get at least 8gb of RAM.

In my head, I call this the 'doubling algorithm'.

If there's anything that's both relatively cheap and useful, but where "more" (either in quality or quantity) has additional utility, 2x it.

Then 2x it again.

Repeat until either: the price change becomes noticeable or utility stops being gained.

Tl;dr -- saving order-of single dollars is rarely worth the tradeoffs.