I've had both the Pioneer 810 and 811 and they're great receivers in their price range but you may want to be careful using them with speakers having impedance's lower than 8ohm. Nominal impedance isn't the constant impedance of the speaker. It's usually higher than the nominal impedance but can sometimes dip below. If the impedance dips down around 4ohms in a certain frequency range for any substantial period of time (scenes requiring lots of power or high volumes) the receiver may shut off. The pioneer amps just can't handle the lower impedances.
You may want to take a look at the deals on refurbished HK 225s. They can handle the lower impedance easily. Don't let the lower power-raiting fool you. HK conservativley rates their amps where-as most manufacturers over-rate them. The HK will in most cases be able to put out more than it's rated power when/if needed. The kenwood 6070 is also a good choice and can be found online for around $300 + SH
Also, being in PR you can probably contact many of the online sellers and have them ship via USPS which should be the same cost as it would be in the US.
Hope this helps
