a safety margin

Hi,

Consider a few scenarios.

(1) You are a sw engineer and you need to allocate a certain amount of memory for an array that you are going use as a "temporary buffer" in your code. Strictly speaking one MByte will suffice ... still you decide to allocate a little more memory ... just to be on the safe side :-)

(2) You are going for a holiday... It is expected that 3,000 bucks should be enough for an all-expenses-paid trip to Paris, but on second thoughts you decide to take another grand with you.

How to convey this idea in English? -
Please correct the following russo-english phrases:

(1) "The array size has been selected with a safety margin of a few bytes"?
(2) The array size was chosen with a few bytes to spare."
(3) "The selected array size looks "enough and to spare" to me."

(4) "A. Do you have any money on you?
B. Enough and to spare this time!"

The more variants, the better :-) The most complicated point to me here is how to use the dangling "to spare" .... cannot paraller the English logic to the Russian one in this case...

mus-te