Hello there, and welcome to HF. You're right, you should have stayed away from the forum if you are afraid of spending way too much. It's inevitable.
As for the IE8 vs. Monster Pro line..... I have MD's and was just doing some back to back with the Sennheisers today. I marveled at how much more advanced the MD's were than the IE8's across the whole frequency range. The bass is better controlled, treble much more detailed and layered, and the biggest difference is in the mids. The MD's just sound so full, lifelike, and natural. They sort of join the rest of the range together into a cohesive sonic picture. The IE8's sound dull and distant by comparison, not just in the mids, but in all aspects. I listen to some industrial stuff, and the IE8's can make it a murky, dull mess, while the MD's convey it much better, further resolving all the electronic layering going on.
I've owned and enjoyed the IE8's for quite a while, and it's taken going through many high end IEM's, and returning/selling them off (Westone 3, Triple.Fi 10, Audio Technica CK90Pro), to finally find something which noticeably eclipses them. As a bonus, the MD's isolate better too.
If you can get past their 'exuberant' looks, the sound more than makes up for it.