>Most of what I'll be using it for is <20MHz or so RF testing, bandwidth
>tests / frequency response of amplifiers, that sort of thing. I'm also
>open to suggestions of similar equipment from other manufacturers...

Keithley and Thurlbey Thandar are both in this market. IIRC you have already 
bought a Tek DPO from TTi, so give them another shout. Otherwise Keithley 
have a range of RF generation gear, they appear to have been quietly getting 
stronger in this area, as well as having some nifty little booklets and CDs 
on doing RF measurements. I haven't been keeping tabs on precisely what they 
have, but from glancing through the leaflets that come across my desk, they 
would be worth a look.

Probably also worth looking at Yokogawa, they seem to be the main Japanese 
supplier of good quality instruments. 

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