Right now I am looking to buy a regular Impulse, but I have a question about what upgrades to get. I'm kinda blurry on the subject of the HFV, the tapeworm ect...... I was wondering, is it best to get both or just one? Would it be better to get the HFV and the HVVC? Is the Pro Derlin Bolt a good bolt? I have so many questions yet so little answers.......Thanks to anyone that helps with my annoying newby questions.