Mixing the Oil for a 2 stroke really becomes a non issue,I thought the same way when I first shopped for a motor ,I havent tried a 4 yet but if this is your first MB Ill bet you would have a whole mess of fun with a 2 and they are cost effective besides.
If you have your heart set on a 4 Go for it!! Id be excited to hear how you make out with it....BEST OF LUCK,be safe