25k can get u a decent z800....2013-2015 model..if lucky mebbe 2016 model.

If ur willing to up the budget to 30k, a used 2017 z900 can be urs..in fact there was one selling below 30k coz he bpught a new bike and it was ready for.collection.

For mt07 vs xj6 maintenance...

Tires will be more expensive on the mt07 coz it uses a 180 rear while xj6.is 160.

Engine oil will need 4 bottles on the xj6 but 3.on the mt07.

Spark plugs will be 4 for xj6 n 2 on mt07

Fuel tank bigger on the xj6

Xj6 is older than mt07.

Personally, id go for z800..or.if able, top up for the z900.

But between xj6 n mt07..id go.mt07...newer and that cp2 braap is

Then just take ur 25k n put it in the bank n save it...maybe look into buying ur dream bike with loan n just make sure u can afford the monthly installments other than the maintenance.

Dont bother buying an intermediate bike as commuter coz the bikes ur looking at will almost roughly have the same running cost as the 1L bike if u use it as a commuter. Keep ur 250 as a commuter first as im sure its more than capable. Coz if u spend 25k to upgrade ur commuter, thats 25k less for u to get ur dream bike.

If still itchy for upgrade coz of long distance or something, i probably wouldnt spend more than 10k for something like an er6n/f. Cheap to run, reliable n darn good bike