Ha just found it too. 4.0, just go with what you like, you can shoot straight, and can carry comfortably.
A couple notes though.
Round size is a forever argument. If you have a .22 that you carry every single day as some have said its way better than that .45 you are reluctant to strap on. I sure dont want a face full of .22 and i wanna watch if you find somebody who does. I personally prefer at least .380/.38 up and personal fave is good old .45acp.
I kinda like a good old .38 s&w revolver for edc. Easy to hide, light and tough. Not to mention sitting in a holster with 5 rounds its under no tension at all. Draw it and pull the DAO trigger. yeah its only 5 shots but if i need more than that a a couple speedloaders out and about i got bigger problems lol. Granted its doubtful a semiauto will have a mag spring give up the ghost if you keep check on it but its nice to know that revolver can be basically forgotten about and then needed and barring a ftf or related ammo malfunction. Itl give you all 5 in a row no questions asked. Not knocking semiauto at all. Just my opinion for edc.
And finally (doubt you'll have this concern since you stated your small budget) dont pack around a high dollar gun. One of those $1000 colt defenders sure is nice but if you should ever have cause to use it. Even totally justified. Law enforcement will most likely take it into evidence while they carry out the investigation. Meaning it could be kept for days to years and even indefinitely. Or i've heard of cases of stuff going "missing" in the evidence locker after the case is closed. Or a similar examle a friend had his unloaded gun in his truck in tennessee(before the recent ccw reciprocity act) and was puleed over for speeding. He dutifully informed the officer of his unloaded firearm and gave his nc ccw permit with his DL. The officer promptly confiscated it and told him he would have to pick it up at the courthouse on or after the court date for his traffic violation and was lucky he wasnt being arrested for illegally carrying in TNor something like tyat. He called and found out they wanted a $500 dollar fee to return it and would have to drive the 4 hrs to pick it up. So including gas in his truck there and back it would have cost him nearly $700 for his $550 glock 19. I'm not saying go cheap as you can because you are going to trust your life with it, I'm saying in the course of the law it is very possible to lose posession of your firearm so just know how much you could be out
these are just my thoughts and opinions. I wish you luck on finding whats right for you and i pray you NEVER need it. Stay safe out there