bigger speakers doesnt mean better sound. you will probably get better sound from the infinity, though people say good stuff about JBL.
I would go with the infinity, thats just me though
I have listened to the infinity beta50 and the jbl e100.I decided on the jbl's.The beta 50's are a little heavier but the sound of the jbl's won me over.Both are good in my opinion. Price wise they are about the same.