I have just bought my second Jeppy Jar logbook but they are huge. But they have plenty of space, if you just an low houred PPL or instructor you won't need most the operational or function time entrys. And i have my doudts why you need so much space for sim training.
But its easy to write in and fairly robust. So i leave it at home and use one of the 6 quid aircrew pocket logbooks to record all my hours in day to day then transfer it over at the end of the week.
MJ