Advice on speakers for a vintage system

Help. I recently took the plunge and had my father's old McIntosh setup completely refurbished (thank you, Circle Stereo). It's a pair of mono blocks, MC-30s (30 watts continuous output), and an MX-110 preamp. Now, I need speakers to run them through. I'm an audiophile newbie and don't know much about power demands, crossovers, etc., so I'm asking you experts for recommendations about minimum specs and possibly brands of speakers. Can any of you take pity on a novice and give some advice that a neophyte could follow?