How much are you looking to spend? Inexpensive is quite a relative term
There are plenty of budget av receivers out there with 100wpc output. Yamaha and sony do a good range with a decent set of features for the budget market.
You wont have a problem with connections, most of the amps allow you to connect a pair of speakers and turn off the surround processing until you get the rest of the set.
Once youve got a full set theres usually a dsp mode that will output a stereo input to the 4 surround speakers (in a 5.1 setup) some with various weird echoy effects
Some features to look for: Pro-Logic(1&2), Dolby Digital, DTS, At least 1 of each of optical and coaxial inputs, and a sub out (phono).
Look at spending about a 3rd of your budget on the amp, the rest on the speakers.
If you go for a surround speaker package then look for a set with some decent sized cabinates. The small discreet home cinema packages are fine for films but dont usualy work that well with music - sound a bit tinny and lack the bass.
For speakers, Mission and Tannoys are decent ones to look out for. If you want a small home cinema set that works well with music then the KEF 2005.2 are excellent. They cost a bit more but are well worth it.
Anyway, goodluck with it.
Jab