There must be a dozen threads in the last month or so on this very topic. Some get quite heated. Some drift around the bend where prices escalate beyond all reason for a hobbyist. In the end, it comes down to a few scopes (three or four) that are worthy entry level devices.
Just do a search on DS1054Z and see what comes up. Ignore any functionality discussions prior to the firmware release in Sept 2016 (currently unavailable because it doesn't work on very old machines, or so I have read). The point is, I have a Tek 485 and I bought the DS1054Z for the 4 channels and serial decoding. It brings a lot more to the dance than just that! I really like the scope.
That's not to say I wouldn't also like the Siglent or the GW-Instek or Rhodes and Schwartz products or even some of the others. Were I rich instead of retired, Keysight might be my first choice. But the DS1054Z is an excellent choice for the money and by the time you get another brand that is similar in spec to the unlocked 1054 (unlocking discussed elsewhere), you're looking at somewhat over $1000. I'll take the $400 model and keep the change.
There are certainly alternatives out there but, bang for buck, the DS1054Z is pretty hard to beat. Last week, this time, we were talking about Tequipment.net having 2660 units in stock. Today there inventory is down to 1879. By the time the 7 days is up, they will have sold about 1000 DS1054Zs. That seems like a lot... Christmas, probably...
http://www.tequipment.net/Rigol/DS1054Z/Digital-Oscilloscopes/?v=7233