I'm sure you already know this but bulking and losing bodyfat just isn't possible. Now for arguements sake you can build a little bit of muscle and lose some fat at same time but not much and you'd need to be very skilled with your training and calorie intake, and even then it's certainly not what I'd call 'bulking'
To bulk you need lots of extra calories and you won't lose bodyfat doing this. To burn fat you need less calories and you need to do cardio, you won't be bulking doing this.
I find the ECA stack comes into it's own when you're getting quite close to your goal as regards to bodyfat and you're starting to struggle to shift those last few stubborn pounds.
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You might want to check out their 80% whey, I think it's £38 for 5kg!! superb stuff that's as high in quality as any on the market, very few brands are as high as 80% and all are at least twice the price.