Sampler packs are a great way to be introduced to different blades. It sounds like you have a nice sampler assembled now. Why not use what you have before buying more?
Sample packs of DE blades work best... www.westcoastshaving.com has great packs there with a great variety..go at least 2 shaves and write down on paper your thoughts...then when it tuggs n pulls..go to another random blade of your choice..do the same on paper..dont forget to have a rating 1-10...10 being amazing and getting 3+ shaves comfortably..make sense?
And it looks like you will have more blades to try out!