Anyone do 3 gallon batches?

[Hoppy2bmerry]

I'm on the fence to buy a 2 pack of 2.5 gallon or 3 gallon kegs. I can get both brand new for about the same price. Any suggestions on this for you 2.5-3 gallon brewers?

Also, my buckets are 7.8 gallons which was fantastic for 5-6 gallon batches however, this is way too big for 3 gallons. Will my 5.0 gallon glass carboy be good for the smaller batches?

I've been fermenting 2.5 gallon batches in a 3 gallon Carboy with a blowoff tube for the start. Only had one krausen so big it pushed the stopper out, and for 3 gallon brews I use a 4 gallon bucket which is perfect.