going pro

You need a deep bankroll to start with.
So no matter what stakes your playing if that br represents money you need to buy stuff (or it will get money taken from it) then it needs to be deep. I dont think you can consider anything less than 2-3k and THATS optimistic for just 25nl and 50nl.
Yes these games are detroyable. I agree with lukie that if you do better than 5bbs/100 you are slaughtering games and need to play higher anyhow. But as a pro you need a deeper bankroll and moving up requires much more than just 20 buy ins for the next level
Personally, i wouldnt be going pro at anything less than 100NL 4 tabling for 5-10hrs per day. Add to that you need a 10k br imo to be able to remove large chunks of cash shud you need them (you having another source of income through your wife makes this seem absurd but many pros at medium stakes play with huge overrolls for their stakes)
Also, you need to know, be certain you can destroy the stakes you are playing. 25nl and 50nl are destroyable for a good player imo, but that depends on good table selection, buddy lists etc.
I agree with lukie here. Until you can show 50k hands at 50nl winning easily and long term i dont think you have an chance of thinking about going pro. Only then can u begin to consider it.

Saying that, bonus sites sugest tht you can bonus whore around the poker comunity for (25 or 50k?) per year if you take advantage of all bonuses etc including casinos i would guess. THAT is a more reliable and attainble goal, but again, i think you need a significantly deeper br than you have at the moment.
(plz someone correct the 25 or 50k, i cant remember, but im pretty sure it was $50k per year on bonus hunting)