hmm good questions Vermin..
1. My current finderscope is the standard 8x50 that comes with the GSO dobs. It functions fine as a finder, annoying having to tilt the head to look through it, but a telrad isn't going to be any different there. I just need to get some red LEDs to illuminate the crosshair.
2. It's a pretty ordinary rack and pinion focuser, again standard on the GSO dobs. There's a lot of slop if the screw isn't turned tight, and when focussing it can make the image shake a bit, especially at high magnifications, which is a real pain when doing webcam imaging, watching it drift out of the FOV in 10 seconds while you're trying to get a wobbling thing focused is hard!
3. I'm a bit of a collimation newbie, i've really only done it a few times and it appears to be fairly accurate atm.. When I do a star test it's mostly round and the spider veins are fairly well centered.. i need to check this again.
4. When looking at M45 I wish I had a widefield.. when looking a the moon I wish I had a high-mag widefield. I like starfields, so I also wish I had a low-mag widefield for open clusters etc.
I tend not to use my barlow that much because I find image quality degrades in it too much, eg: I prefer to use my 15mm rather than use my 32 with the barlow.
From answering those, the focuser is probably high on the list.. But I *want* all of them!
Anyone else got any ideas?