My advice... remember it is all about the weakest link... and therefore you should always be thinking "Upgrade Path", as I know very VERY few people that were able to purchase their entire Systems outright on Day 1.
I personally would do Option #2 first, as I personally always go for Sound Quality over Sound Quantity
Option #1 if your priority is to Rock-Out (as you hinted to): $800 (+ $500) + $1300 = $2600
Get yourself an XPA-3, which will then allow your SR5005 to have enough power to run the Rears. Then if your current source player isn't up to par, it is time to step up to an Oppo BDP-103. If your current source player IS up to par (for it really needs to be), then next in line (Sorry to say...) is a step up to at least an SR6009 (the SR5005 just wasn't Marantz's best foot forward. An SR7008 is Marantz's AVRs starting to NOT sound like the weakest link, and the SR6009/7009 are really quite good for being an AVR, and at half the price of stepping up to an AV7702).
Option #2 will delay your power, but will up your Sound Quality game much quicker: $2000 (+ $500) + $800 = $3300
- more money in the END, however when you do get around to finally being able to add the XPA-3,
your overall System Sound Quality will be much better, and you WILL be able to reap the full benefit
of your newly added Emotiva XPA-3.
Marantz SR7009 (XT32, plus Sound Quality jump, plus adequate power), followed by an Oppo BDP-103 (if need be), followed by an Emotia XPA-3... leaving the SR7009 more than capable of powering your Rear channels now that it is alleviated from having to power the 3 Power-Hungry FRONT channels.
Of course this is only ONE man's opinion, and frankly not knowing enough about what you currently have, and what your Long-Term budget might be, these are only 2 Paths of many that you could take.
Good Luck!