¿Cómo calcular qué altavoces van bien con un determinado receptor A/V?

Llevo tiempo queriéndome comprar un sistema de sonido para mi sala y a pesar de que me he leído cantidad de hilos no consigo encontrar uno que me ayude a elegir el conjunto de altavoces que debería coger como mínimo para el receptor A/V que yo elija. Es decir, no entiendo bien cómo funciona el tema ohmios y vatios.

Para que nos entendamos, si me cojo el receptor ONKYO TX-NR 509 cuyas especificaciones son:

ADVANCED FEATURES

HDMI® Support for 3D, Audio Return Channel, Deep Color™, x.v.Color™, LipSync, Dolby® TrueHD, DTS-HD Master Audio™, DVD-Audio, Super Audio CD, Multichannel PCM, and CEC
Direct Digital Connection of iPod/iPhone via Front- Panel USB Port
Dolby® TrueHD and DTS-HD Master Audio™ Decoding
Overlaid On-Screen Display (OSD) via HDMI
Audyssey 2EQ® for Room Acoustic Correction
Playback of Audio Files Through Local Network (MP3, WMA, WMA Lossless, FLAC, WAV, Ogg Vorbis, AAC, LPCM)
Internet Radio and Music Streaming Service Connectivity (vTuner, Last.fm*, Napster*)
Certified with Windows® 7 and DLNA Version 1.5
Firmware Updates via Ethernet and USB
Zone 2 Line-Out for Distributed Audio Playback in Another Room

* Availability of services depends on region.

AMPLIFIER FEATURES

130 W/Ch at 6 Ω, 1 kHz, 1%, 1 Channel Driven, IEC
H.C.P.S. (High Current Power Supply) Massive High Power Transformer
Optimum Gain Volume Circuitry
PLL (Phase Locked Loop) Jitter-Cleaning Circuit Technology for S/PDIF Audio

PROCESSING FEATURES

TI Burr-Brown 192 kHz/24-Bit DACs for All Channels
Advanced 32-Bit Processing DSP Chip
4 DSP Modes for Gaming: Rock, Sports, Action, and RPG
Advanced Music Optimizer for Compressed Digital Music Files
Mass Storage Class USB Memory Playback Capability
Theater-Dimensional Virtual Surround Function
CinemaFILTER™
Direct Mode
Pure Audio Mode
Double Bass Function
Non-Scaling Configuration
A-Form Listening Mode Memory

CONNECTION FEATURES

4 HDMI Inputs and 1 Output
Universal Port for Onkyo Dock for iPod/iPhone (UP-A1) or DAB+ Radio Tuner (UP-DT1)
HDTV-Capable (720p/1080i) Component Video Switching (2 Inputs and 1 Output)
5 Composite Video Inputs (1 Front/4 Rear) and 2 Outputs
4 Digital Audio Inputs (2 Optical and 2 Coaxial)
6 Analog Audio Inputs (1 Front/5 Rear) and 1 Output
Subwoofer and Surround Back Pre Outs
Color-Coded, Banana Plug-Compatible Speaker Posts
Headphone Jack

OTHER FEATURES

Audyssey Dynamic EQ® for Loudness Correction
Audyssey Dynamic Volume® to Maintain Optimal Listening Level and Dynamic Range
Crossover Adjustment (40/50/60/70/80/90/100/120/150/200 Hz)
A/V Sync Control (Up to 400 ms at 48 kHz)
Tone Control (Bass/Treble) for Front L/R Channels
3-Mode Display Dimmer (Normal/Dim/Dimmer)
RDS (PS/RT/PTY/TP)
40 FM/AM Random Presets
RIHD (Remote Interactive over HDMI) for System Control
Full-Function RI (Remote Interactive) Remote Control

y le pongo el kit de altavoces Harman Kardon HKTS 60 cuyas especificaciones son las siguientes:

Satellite Speaker Features

Midrange Transducer 2 x 75mm flat-panel
High-Frequency Transducer 19mm CMMD Lite dome
Maximum Recommended Amplifier Power 150 Watts
Frequency Response 35Hz - 20kHz (-6dB)
Nominal Impedance 8 Ohm
Sensitivity (2.83V@1m) 83 dB
Wall-Mount Capable Yes
Finish Black Gloss
Dimensions (H x W x D – Metric, English) 299mm x 110mm x 88mm
Weight (Metric, English) 1.5kg

Center Speaker Features

Midrange Transducer 2 x 75mm flat-panel
High-Frequency Transducer 19mm CMMD Lite dome
Maximum Recommended Amplifier Power 150 W
Frequency Response 45Hz – 200Hz (–6dB)
Nominal Impedance 8 ohms
Sensitivity (2.83V @1m) 83 dB
Controls volume, phase, bass boost
Wall-Mount Capable Brackets Included
Finish Black Gloss
Dimensions (H x W x D – Metric, English) 110mm x 272mm x 88mm
Weight (Metric, English) 1.5kg

Subwoofer Features

Low-Frequency Transducer 200mm down-firing cone
Amplifier Power (RMS) 200 W
Frequency Response 45Hz – 200Hz (–6dB)
Controls volume, phase, bass boost
Finish Black Gloss
Dimensions (H x W x D – Metric/English) 353mm x 267mm x 267mm
Weight (Metric/English) 9kg

¿sería un conjunto equilibrado? ¿Cómo sé si me he quedado corto con los altavoces, o por el contrario, con unos de menos potencia me valen? ¿en qué datos nos tenemos que fijar para saber qué conjunto comprar sin riesgo a equivocarnos? muchas gracias por vuestra ayuda y un saludo.