cheezerman wrote:Ok, so now that I'm cutting my teeth with a Silvia, while I save for a real machine...
What should my next step be...
Sell Silvia and get an HX machine -- now!

Sell something else if you need more money.
As a self-inflicted victim of ignoring the advice on this forum and getting a Silvia as my first espresso machine, I can tell you that HB is right: the time spent learning to coax good shots out of Silvia is mostly wasted. I had my Silvia for only a month or so before upgrading.
I've come to believe that Silvia is a nasty newbie trap. Sure, some people have painstakingly learned to pull good shots on her, and I know of at least one professional barista who has a Silvia and says he can pull good shots with her (and I believe him -- he's really talented.) But the vast majority of newcomers really struggle with this machine. I suspect quite a few end up fooling themselves into believing they're pulling good shots while choking down flawed extractions every morning.
Your situation is a little different in that you paid very little for the machine. But I fear you're going to find out that there is such a thing as penny wise and pound foolish.
I assume your Silvia doesn't have a PID, so you'll have to learn how to temperature surf to get a good shot. While HX machine typically need to be flushed to lower the brew temperature before pulling a shot, the flush procedure is nowhere near as complicated as temperature surfing on a Silvia. You also have to jump through hoops to steam milk with Silvia, and the recovery time is quite lengthy. It won't be long before you start asking yourself, "Why can't I consistently pull good shots and steam milk on this thing?" Heaven help you if you have to make more than two milk drinks at a time. If you do manage to tame Silvia, most of that knowledge will be useless when you upgrade.
OK, if you really need time to save up for the HX machine, here's some advice: Buy the best coffee you can find, preferably from one of the specialty roasters recommended on this site. Make sure it's fresh. Get a bottomless portafilter so you can see if there's channeling, spritzing, haloing or other distribution problems. Get a gram scale and weigh your doses to the nearest 0.1g. Don't try to updose -- Silvia doesn't like that. Stay under 16g, preferably closer to 14g. Make sure the pressure is adjusted correctly. Learn how to temperature surf from the many Internet posts and videos on the subject. You have an excellent grinder, which is more than many Silvia owners can say. That'll probably help you with consistency.
And save every penny you can!