I've been doing a ton of reading and study on the 5F1, 5E3, and 5F11. I'm leaning towards building the 5F11 as my first amp. I know mojotone sells component kits that a lot of people are happy with. I'm wondering though if I were to manually select the components myself if I could get some help with finding real high quality components. I would rather spend more and have long lasting, excellent sounding components. Here's the components I'm wondering about: -Output Transformer and Power Transformer. Mercury Magnetics? David Allen? Others? -Electrolytic Capacitors -Orange Drop Capacitors -Jacks. Switchcraft? -Switches -Pots -Resistors -Wire. I notice some wire is cloth covered and some plastic. Does it matter? As for my speaker question. I've heard some people put a 12" speaker in their 5F11. I guess my question is how do you know a certain amp has enough output to drive a larger speaker? I know speakers have a maximum wattage which is usually well over the output from the amplifier, so how do you know the 5F11 can drive a 12" or any amp for that matter can drive a larger speaker than it was designed for? Thanks!