If you're serious about video, 18-135 STM & 50 f/1.4 and a 70D replacing the 650D. In the US, you could pick up that kit for around 1600$ on a good sale, not sure what the EU prices are for it.
I'm recommending the 70D over your 650D as the live view AF is just that much better. I'd only recommend this if you're serious about doing a decent amount of video though. If you're just going to shoot 2 videos a year, it's not worth it.
I think the 17-55 (or 17-50) is a better lens for stills in the 17-55 range than the 18-135, no question. However the 18-135 will be much better if you're serious about video. The AF on the 17-55 will be loud on the video, and if it's your only zoom lens, the added reach will be helpful, especially as it's 2.7X longer than the 17-50.
If you want to do a lot of indoor shooting, I'd recommend investing in a flash, not a fast zoom. Pictures with poor lighting don't look good. While sometimes it's necessary to not use a flash, whenever possible, a simple bounced flash will make your pictures look a million times better.
In general, I'd probably recommend the 85 f/1.8 over the 50 f/1.4 for portraits. However, when looking at only a single prime, I think the 50 is more versatile, as it's short enough to still be useful indoors, while the 85 is really a bit long to be used indoors. I think the added flexibility merits the shorter lens given they're very close in terms of background blur.