Thank you all so much for your feedback! You've given me much to look into!

I REALLY hope I end up working with MOI 'cause I like its UI very much (mostly). And its simplicity is quite endearing. Michael, if you were to add dimensions, labels, drawing scales, and "views" to MOI, I would just stop searching here. Indeed, I'd pay a lot more than $300!

Cheers,
Christopher