i replaced the bearings in my V-Spec to nova ones the day i bought the engine. hadn't had a problem since.
conrod breakage is due to the engine not properly warmed up during break-in, eg. idling 1st few tanks etc. the p/s being very tight will put a lot of stress on the conrod and OS ones are not exactly as durable as the italian ones (thank god they're cheap!).

looking at your price range, you'll get to choose from a wide range of engines.
go for an italian engine which is reliable and will last long if given loving tender care.
i'd highly recommend the Rb S7II. even tho it's a 7port, has good low-end and mileage. smooth powerband = easy to drive.
if you want a 5port, you can look at the nova plus21-5, specs are impressive.
or if you can wait, the ninja engines looks impressive. they'll be out arnd next mth or so.

personally, i've favored 5port engines having had a nova P5T, P5TX and a novamax M5T.
i've had an RB C5 which is more suited for large tracks.
and of course my V-Spec which i only use for races (like you i'm abit skeptical of its lifespan).

btw, i've just PM'ed you...