Which data can I get without power meter?!

Without power meter only training load

Not even a calculate/approx value?! So I think the replacement is useless...

Compared to the 1000 the 830 is smaller, faster, has a much better battery life and a better screen. Not sure the metrics would be enough reason for an upgrade, but the items I've mentioned are why I prefer my 830 to my 1030 (which in itself is a step up from the 1000).

Yeah, what you did mention is of course important, but are personal preferences.. To me, even if I ride10k per year and I have to charge the device every 2 or 3 rides, some useful data could convince me better to replace the 1000 than a better screen (because numbers are numbers, I’m not watching a film..)

• Power meters are cheaper now. You can buy stages or 4iii below 500 eur. Or you can wait for the iq2

it's not a money problem..is that I don't want to keep another crank set at home! otherwise even the only left side would solve most of the problems!

??? you only need one on the bike.  Why would you have to keep another crank at home? 

Crank PM is one possibility.  Power pedals are another, Assioma or Vector for example.  And there's always Powertap hubs.

I meant buying a power meter on the chainring..since I use SPD pedal!! Also, no power tap because I have disc wheels and full carbon spokes wheel on the front!!

SRM X-power pedals are SPD.  The pedal bodies on Assioma pedals can be changed out for SPD compatible pedal bodies, with a caveat on shoes clearing the module.  Powertap makes disc brake hubs (12x142 or 135 QR) , though I think hub PMs have fallen out of favor compared to all the other types.  Except for the cost, I don't think there's a good reason not to have a PM...or two.

the only solution is SRM X-power! thanks!

as disc wheels I meant disc with disc brakes and on the front I don't have normal alu spokes but carbon spokes and no hub.

I'll take a look at that PW!