There's a tack a friend of mine came up with (crediting him because I haven't seen it described in any Diplomacy literature to date) called the "Berlin Basher." Ideally you run it in full press so you can negotiate in the south, and probably in the north too (but unless England is actively anti-Russian in Scandinavia, to the tune of F BAR/A Nwy, you can probably get away with it). The idea is to have an army in Galicia and a fleet in Sweden (or in this case GoB) by the start of W01. You build an army in Silesia with the Rumania build and move:
A Gal -> Sil
A War -> Pru
F GoB -> BAL
There are two results from this. Either one, Germany was just bouncing to be a dick and keep a build away, in which case he probably won't expect this extreme play and Berlin and maybe a second center are yours. Or, two, Germany's bounce was the prelude to an all-out blitz of Russia in S02 (especially if, say, Germany used its 3 builds in F Kie/A Mun/A Ber and blitzed Pru/Sil/BAL himself), in which case Germany's entire strategy is foiled while you retain a pretty solid southern position if Turkey is cooperative.
I doubt it'll be as successful in gunboat because you can't negotiate to make up for weakness in the south, but if Turkey and England aren't out-and-out hostile from 1901 (in which case you have time to bail on this strategy and work with whatcha got) and especially if Italy appears to be attacking Austria (almost guarantees War -> Gal works unsupported in S01, which will keep you from being stood out of Rumania), this is probably worth a shot. You can even do it if Germany lets you into Sweden -- but that'd be kinda mean, huh? ;)