SVT Pro 3, and the SVT450H.
The 450H is the worst bass amp Ive played in a long time, almost in my entire career. In the UK, the 450H is quite expensive. Its around £630!
For that, you can get a LM3 and a VT Bass pedal, and have much more volume.
Or, to open another can of worms, you can get a TC Classic 450/RH450, and it will STILL bury the 450H. Even if the 450H benches at 450W, it will underperform compared to the TC amps.
Other options? You can definitely buy a Genz STL600, almost a 900, you could buy a Shuttle 6.0, and almost a 9.0. The STL900 is probably triple the power of the 450H. Tons of headroom, small, light,
I recommended a bassist to buy the Bass Terror by Orange for his gritty touring amp. He ignored me, and bought the 450H, because he doesnt understand bass (a bad rhythm guitarist), and think Ampeg rules the roost (not so much in 2011). I used it for a set, and it was the worst amp Ive played live. Bad EQ, NO power even with the gain set correctly and master almost full (with boosted mids), and just dull.
Its also very heavy, large, etc. I dont know who would want a fake SVT CL. Either go the LM3/VT route, or buy a CL if you can lift it.
I used to yearn for Ampegs rigs. I was suggested to use them for years, but I stuck with my Trace GP12400SMX (which I no longer own). When I finally bought an 810E to go with the Trace, and eventually an Orange AD200b, the 810E totally let me down. This was apparently the bad era of Ampeg which was a few years back, that Jimmy notes was also a bad era for 810Es. Still, bad era or not, it put me off.
I still look at the new Portaflex 500W amps, but I know a few people who have had them go down on a gig, so thats a no for me. The SVT Pro 7 looks great, but its quite a big amp.