Hi from Australia. I have just set up RC62 centre, RF82 fronts and RC52 rears with Denon 2807 and a subwoofer (whatmough impulse) in a room of 260 sq ft. Awesome. Remember what you are trying to set up for - movies, music, sitcoms - because this should influence your intial choices.
Most modern movies are Dolby Digital. A second hand amp that plays DD will do and should still have resale value in 12 months or so. The denon 2807 is great but not essential initially. Save up for it because the DTS format is really good.
The RC62 is the best value for money centre I have found. Clear on dialogue and very natural sounding. Definate buy. You can do without a centre initially, lossing clarity on dialogue, which is a problem on sitcoms and non-blockbuster movies. If these are important, consider getting a centre (and forgo the subwoofer?). But if you do get a centre, don't compromise because you won't be happy for long.
In a room of 200 sq ft you could use RF62 fronts (or bookself speakers if you prefer) crossed to suby at 80 Hz. This is also a good option if space is limited. But if you want good music (or don't have a good subwoofer), better going for RF82s as the bass extension is better. The problem with most avr's is that you can only set them up one way, so swapping the speaker setup from music to movies can be a pain. Unless you have a good quality suby, don't rely on the suby sounding as good as the RF62s alone on music.
The suby. Well, it is the difference between a home theatre and a stereo. If you live for blockbuster movies, a suby is essential. The advantage of the RF82s over smaller speakers is that they can be set to 'large' and allow the suby to only reproduce the LFE and bass from centre and surrounds. The difference is better, tigher bass, but you may not think the cost of RF82s and a decent suby worthwhile together if you mainly watch non-blockbusters.
So, for blockbuster movies it sounds like you should go for RF82s with a decent subwoofer (and some building reinforcement) and a second hand DD amp, followed by a RC62 center and surrounds when possible. Alternatively, for sitcoms consider RF62s and the RC62 (good front stage) followed by a suby and surrounds. Or if you have good stereo speakers, use them as fronts and go for the RC62 centre and a good suby and perhaps the denon amp. It may not be tone balanced but will do and by then the RF82/62s might be on the second hand market. Welcome to the madness.........