Good amplifier for expansion?

[2DLAKE]

I'm pretty much a newby at steros, so please bear with me.

I'm outfitting my new boat, 23' Wooldridge Sport Drifter Aluminum jet boat with a stereo. What I'm initially having installed at the factory is:

Alpine IDA-X100M Headunit (45w x 4)

Alpine SPR-M700 Speakers (2-way 50-150w)

I may consider installing another pair of speakers as well as a 10" sub once I get the boat and see if there is space. What amp should I start out with just in case I decide to expand? I'd hate to get an amp for the two speakers and have to just buy a new amp in case I upgrade.

I'm eyeballing the Kicker ZX700.5, is this a good choice?

Thanks for your time,

Matt

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