Vince,
I am not familiar with the IZH but the Airgun Warehouse has the IZH MP513 for $129.99 - see:
http://www.airgunwarehouseinc.com/eaaizspairrf.html What caliber are you interested in? Have you considered buying a used RWS 94 - (an excellent gun IMHO)? I have one and it is one of my favorites. It is a clone of the famous FWB 124 and mine is extremely accurate for a high velocity gun. It clocks an honest 934 f/s (avg) with 7.9 grain CPLs. Check it out. Almost everyone I have heard of really likes this gun and it is apparently one of the few guns that actually shoots close to the advertised velocity. I paid 158 bucks for it new, so a used one should be reasonable. They were also made in .22 but are pretty hard to find. I have seen them advertised used from time to time. I would like to have one in .22 myself, but if I get caught bringing another gun home anytime soon, I will be in BIG trouble with " She Who Must Be Obeyed". "Getting caught" - that is the operative expression. Fortunately, I have enough guns already that she can't tell when a new one shows up - LOL (as long as she doesn't see the big brown truck arrive I am safe).
Regarding buying a refurb. from RWS, I would make sure that you could get a full refund if you were not satisfied with the gun they send you. Other than that, I personally would not be afraid to buy one based on the experience of a few folks that I personally know who have had guns repaired by them. Of course, as you know, your mileage may vary.
BTW, for what it's worth, I think you made the right decision on the RM600, mainly because of aftermarket service.
Good luck finding that new gun - always exciting isn't it?
Cheers,
Jim D'
