My DL1000 cost me £140 for the 4,000 miler. It must be similar to what your 650x requires I would think.
Used to do all my own servicing and repair work, and it was good fun and I learned a lot too. Saving money makes you feel good. However, these days I just love riding it and cleaning it and I don't really get much time to do much else. My GT version has loads of luggage space which is why I bought her. I rarely do anything much to it though. I'm lucky...I have a really good dealer and I can find the money to pay him to look after it. He does a good job and doesn't mess people or their bikes about (Parkinsons Motorcycles of Colchester). I took mine for it's 7,500 service and watched most of the time during the service. The workshop blokes are sociable types and good at what they do.
The bike was wheeled in, seat removed and tank propped up, and the checklist started. But first a check for error codes by plugging the ecu in. All was well, then new plugs, a TPS, then a check of the TBS. It was out slightly so this was corrected. Oil and filter changed, engine coolant was changed as the bike was a low mileage two year old, chain and sprockets checked, tyres and pressures checked, head bearings too. Brakes cleaned and checked, lights and all the other electrical stuff checked. Everything that needed it was lubed with grease or oil. Then a complete nut and bolt tightness check. Finally, after re-assembly a road test. The bike was brought back into the workshop however and the seat removed. The bike appeared to be running a tad too lean, so a new ecu map was loaded to richen the first third of throttle setting. Then another road test. The map incidentally was a FOC Suzuki map being loaded to any 1000cc bike that needs it. All dealers seem to have this map. As it happens it was then running a tad too rich after that and so it was changed a few days later for a leaner version but slightly richer than the original Suzuki factory map. Again this aspect was FOC. The bike then ran superbly and much better than it did even when new.
Total cost of the service was £185. Considering the time it took and materials used that's pretty good in my book. I'm an ex car tech and we would have charged much more in labour for that amount of time expended. The main thing is they did a superb job. It was the last service too before the warranty ran out so I wanted to be sure everything was OK. I'm happy. But, if you need to save money or just want to do it yourself, the Stroms are really good bikes to do DIY on. So enjoy!