I'd say that ebay seller is very high risk for scam. They have 0 History as the 0 indicates next to their name. I'd avoid that purchase!
With the other AMD and INTEL builds your looking at. I would research the quality of the board and features the boards have and look at benchmark results for the processors to determine which one to go with.
Intel will be more power efficient, but you pay a premium for the INTEL brand. Additionally there are strengths and weaknesses depending on how the system will be used. So is it for gaming or just web surfing or graphic design or programming or CAD etc. Stuff like that also determine which processor is best suited for the user. However as long as the processor meets or exceeds the minimum requirements then the software whatever it may be will run on it. However some run better than others and its not just the CPU frequency. It comes down to Cache and Internal Processor Instruction Sets that can make one processor better than the other if a piece of software can benefit from an instruction set that one processor has that another is lacking.
