I am editing a feature right now shot on HDCAM. I went through the whole to downconvert to not downconvert issue. Ultimately, I just rented an HDCAM Player (as opposed to player/recorder) the Sony J-H3 which was pretty cheap at $850 a week and captured into 720p DVCPROHD 23.98.
I would suggest just having your footage telecined to DVCProHD tapes at 23.98 NDF and then ingesting that. This will save you the pulldown problem and DVCPro decks are CHEAP! Plus you have the added benefit of cutting in HD and can easily produce high-quality dubs throughout the process. Just rent the deck for principal photography because once everything is ingested, you are good to go.
Also, I'm sure you know this but buy the tapes yourself and supply the telecine house with blank media. This can save you loads of money... figure about a $10-20 markup per tape and you will quickly see a huge a cost savings.