What's your advice?

Get a copy of ON4UN's low band DXing.

Search the Topband archives antennas.

Measure/estimate your ground conductivity and permittivity and get
comfortable with a modeling program.

And finally, experiment.

I don't mean to be glib but there's really no quick answer to what
antenna you'd be happy with for DX on 40,80 and 160. 30 feet for a
horizontal antenna *is* too low, generally.

Maybe someone can comment on the Voyager DX... I can't, specifically.
Verticals are good, short verticals are compromises and must be treated
with care.

- - - - - - - - -

This is what I use:

http://www.n3ox.net/projects/sixtyvert

I can certainly work more 40&80m DX on this than on the 30 foot high,
100 foot long centerfed wire I used to use on those bands. As far as
160m goes, this is the first time I can work 160 DX at all...

73,
Dan