Opinion: Top 5 rendering/layout engines

Hey guys I was wondering..

In your opinion, what are the top 5 companys that have small footprint browsers for sale. Preferably under the 90k mark. With optional addons for video decoding, music decoding ad can have full features of Mozilla FireFox?

I only know of Gecko, iCab, and Presto


Thanks a lot in advance

PS I AM VERY NEW TO THIS and most likely dunno wtf I am talking about. Sorry in advance.