Blueridger,
This is not just for you, but for everyone who is thinking about and/or in the process of opening a coffee shop. An espresso machine is not an afterthought. The time you take to understand, know, and invest in a quality espresso machine and, even moreseo, how to pull a great shot of espresso will be a clear indication of your chances for success in this business.
Now if you don't care about how good the main ingredient for all of your espresso based drinks is, then by all means, buy whatever machine comes your way. And remember, with very little exception, the maintenance ppl are experts at maintaining machines and, unless captive, at assessing the durability of X machine. They are not experts at making espresso. Great machines rarely need major service, just basic maintenance.
There's a difference between "having a budget" and "not being able to afford to open a shop yet." If, for instance, the difference between $5K and $10K would be beyond your budget, then you do not have the funds necessary to open. And pick any spread of $5K, whether it's 3 and 8 or 9 and 14, it's nickels and dimes in the greater scheme. Opening a coffee shop can be done on a budget, but the budget needs to be realistic... and include at least 15% extra for things that you might have missed and a good $12-15K or more additional cash (some would say more) for beginning cash flow.
Find the best espresso machine you can in your area, based on industry feedback (from experts, not from Joe Yahoo who owns three shops and seems like a good guy), personal knowledge, hands-on, etc., and then find the best price you can for that machine. And if used, get if from a reputable vendor, like ones you mentioned, or a professional you know has maintained the machine properly. The espresso machine is the heart and soul of your operation. A realistic budget is sound business thinking. Being cheap is not. Be wise, not cheap.
Best to you.