Heres a list of discontinued STBS. Be careful what you by NOW. As you know some are still getting support for NOW. If you buy one of these STB make sure you get a GOOD deal.
Viewsat: VS Platinum VS Xtreme VS PVR 7000
Fortec: Fortec Life Time Ultra
Pansat: Pansat 2500 A Pansat 2700 A/E , (One of their best.) Pansat 3500/SD/SD+ Pansat 9000 HD
SonicView: SV 1000 SV 4000, (One of their best.) SV PVR 1000
Captive Works: CW 600 Cw 600 S Premium
Digiwave: 5900 7000 7200
CNX: Mini, replaced with the nano
Coo*lsat: 4000 5000 6000 Support is back for NOW.
nFusion nova (beware of nova clones). Support should stay strong, it is same stb as it's new replacement, nFusion solaris, (same bin files).
The above lists a lot of receivers that although discontinued, have, in fact, very good support. However, the following is a list of receivers you must totally avoid, as being doorstops.
ARIZA 700,700s,750,800, Xtreme Captiveworks 500 Cooltec and C00LSAT CLONES Foretc Classic NA KBOX K1 heros Triple Dragon VANTAGE Microyal mrx1000