How many taller candles should I use?

So, I'm using 5 small short candles, but, I really want to add some taller crystal for candles like the one I posted.

How many of these should I use doe it doesn't look akward on the table? By the way-I LOVE CANDLES!
Not sure whether I should add one in b/w all 5...that would be 10 candles!! =0

I was actually leaning more towards doing 3...so that would be only 8 candles on the table.