I need your advice, please

As regular readers will know, I'm getting ready to publish my first military SF novels within a couple of months.  The first book will hopefully be out by the end of the second quarter, with a sequel to follow it within a month or two after that.  A third book in the series is planned to be ready for the Christmas shopping season, if all goes well and I don't get too distracted!  The first will be priced (in e-book format) at $2.99, and probably the second as well, in order to 'break in' to the market.  Pricing for the third is uncertain - it depends on how well I do with the first and second volumes.

My problem is this.  I'm not sure which platform(s) to concentrate on for distributing it.  If I go exclusively with Amazon, using their Kindle Direct Publishing Select package, it offers a number of advantages, including simplicity, greater financial flexibility, etc.  Kindle reader software and/or apps is/are available (free of charge) for almost any computer platform and for smartphones, so it's not as if readers have to actually buy a Kindle device in order to read Kindle books - they can use their existing devices.  On the other hand, I know Amazon hasn't penetrated overseas markets as much as it has in North America.  Many readers in Europe and elsewhere use the Barnes & Noble Nook, Kobo, or other devices and software to read e-books.  If I go with KDP Select, I won't be able to offer those formats for sale.

I'd also like to know what the demand might be for a print version of the books.  It's relatively straightforward, and has minimal setup costs, to publish an e-book.  It's more costly and time-consuming to format and prepare a dead-tree edition, but if the demand is there, I'm willing to do it.  I just need to know how many folks would like that.

So, readers, will you please help me?  I need to hear from those of you who are definitely interested in reading my books.  (If you hate the very thought and intend to avoid them like the plague, of course this doesn't apply to you!)  I need to know whether you'll be adequately served by Amazon alone, and an e-book alone, or whether you'd prefer me to make the book available on other services as well, and in print format.

If enough of you want the latter options, of course I'll go with what you want.  It'll involve losing some of the advantages offered by KDP Select, and entail a lot more work in formatting the novel for other platforms and for print, but I can live with those things if I have to.  However, right now I don't know if it's necessary - which is where you come in.  Please respond in a comment to this post;  or, if you have problems with Captcha word verification, please send me an e-mail (my address is in my blog profile).

Many thanks.

Peter