[SI-LIST] Inexpensive SI software

I've been doing some freelance PCB layout using a low cost PCB CAD software 
(Cadsoft's EAGLE).  I'm 
getting into situations designing denser 4 layer boards where it would handy to 
use an SI tool.  I'm 
concerned about rise/fall times of 1 - 2 ns or faster signals, crosstalk, the 
effects of long 
traces, and switching layers (top to bottom), etc.  I've download the HyperLynx 
demo (BoardSim & 
LineSIM), and it looks really cool.  But I can't actually use the demo to 
anything real.  And I 
suspect I can't afford it.  I'd like to spend no more than $4K(USD).  As an 
alternative, I've 
considered buying Altium's Designer software ($4K) that claims to have built-in 
SI abilities.  Are 
Altium's SI features any good?

Suggestions, anyone?
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