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Best bang for buck is the RM4 as it has all the features such as recoil, bolt stop and so on and is decent out the box, get the RM4A1 if you can. Most of the RM4 gearbox and barrel set is upgrade able though there are a number of proprietary parts that you need to work around.
Increasing the spring strength would also increase the felt recoil, as long as the springs you are changing are linear. Non linear springs would decrease the felt recoil by a significant amount.
Some people have problems with cracked receivers, ive only seen it with the old PTS RM4 models however. I have a PTS RM4 but the body feels fine to me with no cracks even though ive gamed it pretty hard and have taken it apart hundreds of times by now. Id imagine they might have fixed it with the new RM4A1 as the body has been changed.
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