I tendered my resignation before I had anything firmed up to move to, but was made a few offers within my notice period, with reasonable increases in compensation package, mainly because I was pretty much underpaid.

I would only recommend that you do so only if you are confident that your profile and experience is in demand. Also, speak with your partner/parents to be sure you have their support to do this - as your income might matter to them. If you have no financial obligations or worries, it makes the decision to tender without a job to move to an easier one.